Home / 31,021.38-42,812.28-18,274.68

Finding the Fourth Proportional to 31,021.38, 42,812.28 and 18,274.68

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Solution

The fourth proportional to 31,021.38, 42,812.28 and 18,274.68 is: 25,220.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,021.38 : 42,812.28 = 18,274.68 : x
  2. Step 2: Convert to fraction form
    31,021.38/42,812.28 = 18,274.68/x
  3. Step 3: Cross multiply
    31,021.38x = 42,812.28 × 18,274.68
  4. Step 4: Simplify right side
    31,021.38x = 782,380,717.07
  5. Step 5: Solve for x
    x = 782,380,717.07/31,021.38
  6. Step 6: Final answer
    x = 25,220.69

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Half scale
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Double scale
Find fourth proportional to 31,022.38, 42,813.66 and 18,275.68
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.