Home / 87,376.58-120,330.12-78,688.79

Finding the Fourth Proportional to 87,376.58, 120,330.12 and 78,688.79

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Solution

The fourth proportional to 87,376.58, 120,330.12 and 78,688.79 is: 108,365.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,376.58 : 120,330.12 = 78,688.79 : x
  2. Step 2: Convert to fraction form
    87,376.58/120,330.12 = 78,688.79/x
  3. Step 3: Cross multiply
    87,376.58x = 120,330.12 × 78,688.79
  4. Step 4: Simplify right side
    87,376.58x = 9,468,631,543.35
  5. Step 5: Solve for x
    x = 9,468,631,543.35/87,376.58
  6. Step 6: Final answer
    x = 108,365.78

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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.