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Finding the Fourth Proportional to 487,807.90, 731,930.55 and 221,431.30

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Solution

The fourth proportional to 487,807.90, 731,930.55 and 221,431.30 is: 332,246.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,807.90 : 731,930.55 = 221,431.30 : x
  2. Step 2: Convert to fraction form
    487,807.90/731,930.55 = 221,431.30/x
  3. Step 3: Cross multiply
    487,807.90x = 731,930.55 × 221,431.30
  4. Step 4: Simplify right side
    487,807.90x = 162,072,333,196.22
  5. Step 5: Solve for x
    x = 162,072,333,196.22/487,807.90
  6. Step 6: Final answer
    x = 332,246.22

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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.