Home / 31,086.40-42,904.78-18,338.80

Finding the Fourth Proportional to 31,086.40, 42,904.78 and 18,338.80

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Solution

The fourth proportional to 31,086.40, 42,904.78 and 18,338.80 is: 25,310.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,086.40 : 42,904.78 = 18,338.80 : x
  2. Step 2: Convert to fraction form
    31,086.40/42,904.78 = 18,338.80/x
  3. Step 3: Cross multiply
    31,086.40x = 42,904.78 × 18,338.80
  4. Step 4: Simplify right side
    31,086.40x = 786,822,179.46
  5. Step 5: Solve for x
    x = 786,822,179.46/31,086.40
  6. Step 6: Final answer
    x = 25,310.82

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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.