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Finding the Fourth Proportional to 79,681.60, 109,979.28 and 45,689.47

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Solution

The fourth proportional to 79,681.60, 109,979.28 and 45,689.47 is: 63,062.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,681.60 : 109,979.28 = 45,689.47 : x
  2. Step 2: Convert to fraction form
    79,681.60/109,979.28 = 45,689.47/x
  3. Step 3: Cross multiply
    79,681.60x = 109,979.28 × 45,689.47
  4. Step 4: Simplify right side
    79,681.60x = 5,024,895,014.18
  5. Step 5: Solve for x
    x = 5,024,895,014.18/79,681.60
  6. Step 6: Final answer
    x = 63,062.18

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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.