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Finding the Fourth Proportional to 487,603.12, 731,141.70 and 221,218.29

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Solution

The fourth proportional to 487,603.12, 731,141.70 and 221,218.29 is: 331,708.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,603.12 : 731,141.70 = 221,218.29 : x
  2. Step 2: Convert to fraction form
    487,603.12/731,141.70 = 221,218.29/x
  3. Step 3: Cross multiply
    487,603.12x = 731,141.70 × 221,218.29
  4. Step 4: Simplify right side
    487,603.12x = 161,741,916,621.69
  5. Step 5: Solve for x
    x = 161,741,916,621.69/487,603.12
  6. Step 6: Final answer
    x = 331,708.12

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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.