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Finding the Fourth Proportional to 487,603.62, 731,142.45 and 221,218.79

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Solution

The fourth proportional to 487,603.62, 731,142.45 and 221,218.79 is: 331,708.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,603.62 : 731,142.45 = 221,218.79 : x
  2. Step 2: Convert to fraction form
    487,603.62/731,142.45 = 221,218.79/x
  3. Step 3: Cross multiply
    487,603.62x = 731,142.45 × 221,218.79
  4. Step 4: Simplify right side
    487,603.62x = 161,742,444,450.92
  5. Step 5: Solve for x
    x = 161,742,444,450.92/487,603.62
  6. Step 6: Final answer
    x = 331,708.87

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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.