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Finding the Fourth Proportional to 8,979.84, 12,387.42 and 5,442.36

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Solution

The fourth proportional to 8,979.84, 12,387.42 and 5,442.36 is: 7,507.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.84 : 12,387.42 = 5,442.36 : x
  2. Step 2: Convert to fraction form
    8,979.84/12,387.42 = 5,442.36/x
  3. Step 3: Cross multiply
    8,979.84x = 12,387.42 × 5,442.36
  4. Step 4: Simplify right side
    8,979.84x = 67,416,799.11
  5. Step 5: Solve for x
    x = 67,416,799.11/8,979.84
  6. Step 6: Final answer
    x = 7,507.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.