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Finding the Fourth Proportional to 71,086.40, 106,578.40 and 39,931.20

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Solution

The fourth proportional to 71,086.40, 106,578.40 and 39,931.20 is: 59,868.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,086.40 : 106,578.40 = 39,931.20 : x
  2. Step 2: Convert to fraction form
    71,086.40/106,578.40 = 39,931.20/x
  3. Step 3: Cross multiply
    71,086.40x = 106,578.40 × 39,931.20
  4. Step 4: Simplify right side
    71,086.40x = 4,255,803,406.08
  5. Step 5: Solve for x
    x = 4,255,803,406.08/71,086.40
  6. Step 6: Final answer
    x = 59,868.04

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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.