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Finding the Fourth Proportional to 71,287.40, 106,931.10 and 43,293.80

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Solution

The fourth proportional to 71,287.40, 106,931.10 and 43,293.80 is: 64,940.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,287.40 : 106,931.10 = 43,293.80 : x
  2. Step 2: Convert to fraction form
    71,287.40/106,931.10 = 43,293.80/x
  3. Step 3: Cross multiply
    71,287.40x = 106,931.10 × 43,293.80
  4. Step 4: Simplify right side
    71,287.40x = 4,629,453,657.18
  5. Step 5: Solve for x
    x = 4,629,453,657.18/71,287.40
  6. Step 6: Final answer
    x = 64,940.70

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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.