Home / 21,143.25-31,720.14-7,995.69

Finding the Fourth Proportional to 21,143.25, 31,720.14 and 7,995.69

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Solution

The fourth proportional to 21,143.25, 31,720.14 and 7,995.69 is: 11,995.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,143.25 : 31,720.14 = 7,995.69 : x
  2. Step 2: Convert to fraction form
    21,143.25/31,720.14 = 7,995.69/x
  3. Step 3: Cross multiply
    21,143.25x = 31,720.14 × 7,995.69
  4. Step 4: Simplify right side
    21,143.25x = 253,624,406.20
  5. Step 5: Solve for x
    x = 253,624,406.20/21,143.25
  6. Step 6: Final answer
    x = 11,995.53

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.