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Finding the Fourth Proportional to 458,633.40, 687,366.90 and 408,478.20

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Solution

The fourth proportional to 458,633.40, 687,366.90 and 408,478.20 is: 612,197.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,633.40 : 687,366.90 = 408,478.20 : x
  2. Step 2: Convert to fraction form
    458,633.40/687,366.90 = 408,478.20/x
  3. Step 3: Cross multiply
    458,633.40x = 687,366.90 × 408,478.20
  4. Step 4: Simplify right side
    458,633.40x = 280,774,394,051.58
  5. Step 5: Solve for x
    x = 280,774,394,051.58/458,633.40
  6. Step 6: Final answer
    x = 612,197.88

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1.5x scale

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.