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Finding the Fourth Proportional to 291,680.72, 437,545.76 and 81,318.84

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Solution

The fourth proportional to 291,680.72, 437,545.76 and 81,318.84 is: 121,985.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,680.72 : 437,545.76 = 81,318.84 : x
  2. Step 2: Convert to fraction form
    291,680.72/437,545.76 = 81,318.84/x
  3. Step 3: Cross multiply
    291,680.72x = 437,545.76 × 81,318.84
  4. Step 4: Simplify right side
    291,680.72x = 35,580,713,650.12
  5. Step 5: Solve for x
    x = 35,580,713,650.12/291,680.72
  6. Step 6: Final answer
    x = 121,985.14

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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.