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Finding the Fourth Proportional to 7,979.92, 10,987.18 and 7,241.81

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Solution

The fourth proportional to 7,979.92, 10,987.18 and 7,241.81 is: 9,970.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,979.92 : 10,987.18 = 7,241.81 : x
  2. Step 2: Convert to fraction form
    7,979.92/10,987.18 = 7,241.81/x
  3. Step 3: Cross multiply
    7,979.92x = 10,987.18 × 7,241.81
  4. Step 4: Simplify right side
    7,979.92x = 79,566,996.96
  5. Step 5: Solve for x
    x = 79,566,996.96/7,979.92
  6. Step 6: Final answer
    x = 9,970.90

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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.