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Finding the Fourth Proportional to 103,689.52, 143,135.68 and 69,717.72

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Solution

The fourth proportional to 103,689.52, 143,135.68 and 69,717.72 is: 96,240.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,689.52 : 143,135.68 = 69,717.72 : x
  2. Step 2: Convert to fraction form
    103,689.52/143,135.68 = 69,717.72/x
  3. Step 3: Cross multiply
    103,689.52x = 143,135.68 × 69,717.72
  4. Step 4: Simplify right side
    103,689.52x = 9,979,093,260.25
  5. Step 5: Solve for x
    x = 9,979,093,260.25/103,689.52
  6. Step 6: Final answer
    x = 96,240.13

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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.