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Finding the Fourth Proportional to 291,680.72, 437,545.78 and 81,318.86

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Solution

The fourth proportional to 291,680.72, 437,545.78 and 81,318.86 is: 121,985.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,680.72 : 437,545.78 = 81,318.86 : x
  2. Step 2: Convert to fraction form
    291,680.72/437,545.78 = 81,318.86/x
  3. Step 3: Cross multiply
    291,680.72x = 437,545.78 × 81,318.86
  4. Step 4: Simplify right side
    291,680.72x = 35,580,724,027.41
  5. Step 5: Solve for x
    x = 35,580,724,027.41/291,680.72
  6. Step 6: Final answer
    x = 121,985.18

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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.