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Finding the Fourth Proportional to 323,630.10, 485,444.70 and 86,972.78

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Solution

The fourth proportional to 323,630.10, 485,444.70 and 86,972.78 is: 130,459.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,630.10 : 485,444.70 = 86,972.78 : x
  2. Step 2: Convert to fraction form
    323,630.10/485,444.70 = 86,972.78/x
  3. Step 3: Cross multiply
    323,630.10x = 485,444.70 × 86,972.78
  4. Step 4: Simplify right side
    323,630.10x = 42,220,475,095.27
  5. Step 5: Solve for x
    x = 42,220,475,095.27/323,630.10
  6. Step 6: Final answer
    x = 130,459.05

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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.