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Finding the Fourth Proportional to 487,728.20, 731,246.70 and 221,616.20

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Solution

The fourth proportional to 487,728.20, 731,246.70 and 221,616.20 is: 332,267.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,728.20 : 731,246.70 = 221,616.20 : x
  2. Step 2: Convert to fraction form
    487,728.20/731,246.70 = 221,616.20/x
  3. Step 3: Cross multiply
    487,728.20x = 731,246.70 × 221,616.20
  4. Step 4: Simplify right side
    487,728.20x = 162,056,114,916.54
  5. Step 5: Solve for x
    x = 162,056,114,916.54/487,728.20
  6. Step 6: Final answer
    x = 332,267.26

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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.