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Finding the Fourth Proportional to 78,445.42, 117,718.17 and 28,520.73

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Solution

The fourth proportional to 78,445.42, 117,718.17 and 28,520.73 is: 42,799.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,445.42 : 117,718.17 = 28,520.73 : x
  2. Step 2: Convert to fraction form
    78,445.42/117,718.17 = 28,520.73/x
  3. Step 3: Cross multiply
    78,445.42x = 117,718.17 × 28,520.73
  4. Step 4: Simplify right side
    78,445.42x = 3,357,408,142.66
  5. Step 5: Solve for x
    x = 3,357,408,142.66/78,445.42
  6. Step 6: Final answer
    x = 42,799.29

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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.