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Finding the Fourth Proportional to 642,387.90, 886,458.26 and 355,890.90

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Solution

The fourth proportional to 642,387.90, 886,458.26 and 355,890.90 is: 491,108.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,387.90 : 886,458.26 = 355,890.90 : x
  2. Step 2: Convert to fraction form
    642,387.90/886,458.26 = 355,890.90/x
  3. Step 3: Cross multiply
    642,387.90x = 886,458.26 × 355,890.90
  4. Step 4: Simplify right side
    642,387.90x = 315,482,427,963.83
  5. Step 5: Solve for x
    x = 315,482,427,963.83/642,387.90
  6. Step 6: Final answer
    x = 491,108.92

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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.