Home / 78,349.20-107,972.10-76,909.56

Finding the Fourth Proportional to 78,349.20, 107,972.10 and 76,909.56

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Solution

The fourth proportional to 78,349.20, 107,972.10 and 76,909.56 is: 105,988.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,349.20 : 107,972.10 = 76,909.56 : x
  2. Step 2: Convert to fraction form
    78,349.20/107,972.10 = 76,909.56/x
  3. Step 3: Cross multiply
    78,349.20x = 107,972.10 × 76,909.56
  4. Step 4: Simplify right side
    78,349.20x = 8,304,086,703.28
  5. Step 5: Solve for x
    x = 8,304,086,703.28/78,349.20
  6. Step 6: Final answer
    x = 105,988.15

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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.