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Finding the Fourth Proportional to 642,542.98, 886,687 and 356,089.72

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Solution

The fourth proportional to 642,542.98, 886,687 and 356,089.72 is: 491,391.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,542.98 : 886,687 = 356,089.72 : x
  2. Step 2: Convert to fraction form
    642,542.98/886,687 = 356,089.72/x
  3. Step 3: Cross multiply
    642,542.98x = 886,687 × 356,089.72
  4. Step 4: Simplify right side
    642,542.98x = 315,740,125,557.64
  5. Step 5: Solve for x
    x = 315,740,125,557.64/642,542.98
  6. Step 6: Final answer
    x = 491,391.45

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1.5x scale

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.