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Finding the Fourth Proportional to 408,565.60, 612,848.56 and 128,104.72

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Solution

The fourth proportional to 408,565.60, 612,848.56 and 128,104.72 is: 192,157.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,565.60 : 612,848.56 = 128,104.72 : x
  2. Step 2: Convert to fraction form
    408,565.60/612,848.56 = 128,104.72/x
  3. Step 3: Cross multiply
    408,565.60x = 612,848.56 × 128,104.72
  4. Step 4: Simplify right side
    408,565.60x = 78,508,793,181.20
  5. Step 5: Solve for x
    x = 78,508,793,181.20/408,565.60
  6. Step 6: Final answer
    x = 192,157.13

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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.