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Finding the Fourth Proportional to 80,915.65, 111,711.43 and 71,938.31

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Solution

The fourth proportional to 80,915.65, 111,711.43 and 71,938.31 is: 99,317.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,915.65 : 111,711.43 = 71,938.31 : x
  2. Step 2: Convert to fraction form
    80,915.65/111,711.43 = 71,938.31/x
  3. Step 3: Cross multiply
    80,915.65x = 111,711.43 × 71,938.31
  4. Step 4: Simplify right side
    80,915.65x = 8,036,330,743.48
  5. Step 5: Solve for x
    x = 8,036,330,743.48/80,915.65
  6. Step 6: Final answer
    x = 99,317.39

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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.