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Finding the Fourth Proportional to 71,363.80, 107,045.70 and 66,989.80

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Solution

The fourth proportional to 71,363.80, 107,045.70 and 66,989.80 is: 100,484.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,363.80 : 107,045.70 = 66,989.80 : x
  2. Step 2: Convert to fraction form
    71,363.80/107,045.70 = 66,989.80/x
  3. Step 3: Cross multiply
    71,363.80x = 107,045.70 × 66,989.80
  4. Step 4: Simplify right side
    71,363.80x = 7,170,970,033.86
  5. Step 5: Solve for x
    x = 7,170,970,033.86/71,363.80
  6. Step 6: Final answer
    x = 100,484.70

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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.