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Finding the Fourth Proportional to 458,620.40, 687,347.40 and 408,465.20

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Solution

The fourth proportional to 458,620.40, 687,347.40 and 408,465.20 is: 612,178.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,620.40 : 687,347.40 = 408,465.20 : x
  2. Step 2: Convert to fraction form
    458,620.40/687,347.40 = 408,465.20/x
  3. Step 3: Cross multiply
    458,620.40x = 687,347.40 × 408,465.20
  4. Step 4: Simplify right side
    458,620.40x = 280,757,493,210.48
  5. Step 5: Solve for x
    x = 280,757,493,210.48/458,620.40
  6. Step 6: Final answer
    x = 612,178.38

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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.