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Finding the Fourth Proportional to 8,681.12, 11,979.04 and 5,143.64

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Solution

The fourth proportional to 8,681.12, 11,979.04 and 5,143.64 is: 7,097.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,681.12 : 11,979.04 = 5,143.64 : x
  2. Step 2: Convert to fraction form
    8,681.12/11,979.04 = 5,143.64/x
  3. Step 3: Cross multiply
    8,681.12x = 11,979.04 × 5,143.64
  4. Step 4: Simplify right side
    8,681.12x = 61,615,869.31
  5. Step 5: Solve for x
    x = 61,615,869.31/8,681.12
  6. Step 6: Final answer
    x = 7,097.69

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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.