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Finding the Fourth Proportional to 79,689.28, 109,969.98 and 47,446.40

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Solution

The fourth proportional to 79,689.28, 109,969.98 and 47,446.40 is: 65,475.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,689.28 : 109,969.98 = 47,446.40 : x
  2. Step 2: Convert to fraction form
    79,689.28/109,969.98 = 47,446.40/x
  3. Step 3: Cross multiply
    79,689.28x = 109,969.98 × 47,446.40
  4. Step 4: Simplify right side
    79,689.28x = 5,217,679,659.07
  5. Step 5: Solve for x
    x = 5,217,679,659.07/79,689.28
  6. Step 6: Final answer
    x = 65,475.30

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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.