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Finding the Fourth Proportional to 458,540.80, 687,811.20 and 427,436.80

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Solution

The fourth proportional to 458,540.80, 687,811.20 and 427,436.80 is: 641,155.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,540.80 : 687,811.20 = 427,436.80 : x
  2. Step 2: Convert to fraction form
    458,540.80/687,811.20 = 427,436.80/x
  3. Step 3: Cross multiply
    458,540.80x = 687,811.20 × 427,436.80
  4. Step 4: Simplify right side
    458,540.80x = 293,995,818,332.16
  5. Step 5: Solve for x
    x = 293,995,818,332.16/458,540.80
  6. Step 6: Final answer
    x = 641,155.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.