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Finding the Fourth Proportional to 87,689.71, 121,027.40 and 51,899.46

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Solution

The fourth proportional to 87,689.71, 121,027.40 and 51,899.46 is: 71,630.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,689.71 : 121,027.40 = 51,899.46 : x
  2. Step 2: Convert to fraction form
    87,689.71/121,027.40 = 51,899.46/x
  3. Step 3: Cross multiply
    87,689.71x = 121,027.40 × 51,899.46
  4. Step 4: Simplify right side
    87,689.71x = 6,281,256,705.20
  5. Step 5: Solve for x
    x = 6,281,256,705.20/87,689.71
  6. Step 6: Final answer
    x = 71,630.49

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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.