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Finding the Fourth Proportional to 78,451.70, 117,691.65 and 28,601.73

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Solution

The fourth proportional to 78,451.70, 117,691.65 and 28,601.73 is: 42,907.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,451.70 : 117,691.65 = 28,601.73 : x
  2. Step 2: Convert to fraction form
    78,451.70/117,691.65 = 28,601.73/x
  3. Step 3: Cross multiply
    78,451.70x = 117,691.65 × 28,601.73
  4. Step 4: Simplify right side
    78,451.70x = 3,366,184,796.55
  5. Step 5: Solve for x
    x = 3,366,184,796.55/78,451.70
  6. Step 6: Final answer
    x = 42,907.74

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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.