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Finding the Fourth Proportional to 663,963.78, 916,062.31 and 392,127.89

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Solution

The fourth proportional to 663,963.78, 916,062.31 and 392,127.89 is: 541,013.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,963.78 : 916,062.31 = 392,127.89 : x
  2. Step 2: Convert to fraction form
    663,963.78/916,062.31 = 392,127.89/x
  3. Step 3: Cross multiply
    663,963.78x = 916,062.31 × 392,127.89
  4. Step 4: Simplify right side
    663,963.78x = 359,213,576,638.67
  5. Step 5: Solve for x
    x = 359,213,576,638.67/663,963.78
  6. Step 6: Final answer
    x = 541,013.81

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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.