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Finding the Fourth Proportional to 28,412.92, 42,617.85 and 8,691.48

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Solution

The fourth proportional to 28,412.92, 42,617.85 and 8,691.48 is: 13,036.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,412.92 : 42,617.85 = 8,691.48 : x
  2. Step 2: Convert to fraction form
    28,412.92/42,617.85 = 8,691.48/x
  3. Step 3: Cross multiply
    28,412.92x = 42,617.85 × 8,691.48
  4. Step 4: Simplify right side
    28,412.92x = 370,412,158.32
  5. Step 5: Solve for x
    x = 370,412,158.32/28,412.92
  6. Step 6: Final answer
    x = 13,036.75

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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.