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Finding the Fourth Proportional to 458,658.40, 687,404.40 and 408,503.20

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Solution

The fourth proportional to 458,658.40, 687,404.40 and 408,503.20 is: 612,235.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,658.40 : 687,404.40 = 408,503.20 : x
  2. Step 2: Convert to fraction form
    458,658.40/687,404.40 = 408,503.20/x
  3. Step 3: Cross multiply
    458,658.40x = 687,404.40 × 408,503.20
  4. Step 4: Simplify right side
    458,658.40x = 280,806,897,094.08
  5. Step 5: Solve for x
    x = 280,806,897,094.08/458,658.40
  6. Step 6: Final answer
    x = 612,235.37

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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.