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Finding the Fourth Proportional to 57,920.40, 86,731.56 and 40,125.78

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Solution

The fourth proportional to 57,920.40, 86,731.56 and 40,125.78 is: 60,085.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,920.40 : 86,731.56 = 40,125.78 : x
  2. Step 2: Convert to fraction form
    57,920.40/86,731.56 = 40,125.78/x
  3. Step 3: Cross multiply
    57,920.40x = 86,731.56 × 40,125.78
  4. Step 4: Simplify right side
    57,920.40x = 3,480,171,495.62
  5. Step 5: Solve for x
    x = 3,480,171,495.62/57,920.40
  6. Step 6: Final answer
    x = 60,085.42

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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.