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Finding the Fourth Proportional to 81,715.60, 112,780.65 and 76,379.32

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Solution

The fourth proportional to 81,715.60, 112,780.65 and 76,379.32 is: 105,415.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,715.60 : 112,780.65 = 76,379.32 : x
  2. Step 2: Convert to fraction form
    81,715.60/112,780.65 = 76,379.32/x
  3. Step 3: Cross multiply
    81,715.60x = 112,780.65 × 76,379.32
  4. Step 4: Simplify right side
    81,715.60x = 8,614,109,356.16
  5. Step 5: Solve for x
    x = 8,614,109,356.16/81,715.60
  6. Step 6: Final answer
    x = 105,415.73

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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.