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Finding the Fourth Proportional to 402,717.38, 555,735.76 and 221,428.04

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Solution

The fourth proportional to 402,717.38, 555,735.76 and 221,428.04 is: 305,562.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,717.38 : 555,735.76 = 221,428.04 : x
  2. Step 2: Convert to fraction form
    402,717.38/555,735.76 = 221,428.04/x
  3. Step 3: Cross multiply
    402,717.38x = 555,735.76 × 221,428.04
  4. Step 4: Simplify right side
    402,717.38x = 123,055,476,762.46
  5. Step 5: Solve for x
    x = 123,055,476,762.46/402,717.38
  6. Step 6: Final answer
    x = 305,562.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.