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Finding the Fourth Proportional to 642,559.80, 886,737.66 and 356,084.64

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Solution

The fourth proportional to 642,559.80, 886,737.66 and 356,084.64 is: 491,399.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,559.80 : 886,737.66 = 356,084.64 : x
  2. Step 2: Convert to fraction form
    642,559.80/886,737.66 = 356,084.64/x
  3. Step 3: Cross multiply
    642,559.80x = 886,737.66 × 356,084.64
  4. Step 4: Simplify right side
    642,559.80x = 315,753,660,435.54
  5. Step 5: Solve for x
    x = 315,753,660,435.54/642,559.80
  6. Step 6: Final answer
    x = 491,399.65

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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.