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Finding the Fourth Proportional to 143,871.10, 215,515.05 and 81,468.70

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Solution

The fourth proportional to 143,871.10, 215,515.05 and 81,468.70 is: 122,037.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,871.10 : 215,515.05 = 81,468.70 : x
  2. Step 2: Convert to fraction form
    143,871.10/215,515.05 = 81,468.70/x
  3. Step 3: Cross multiply
    143,871.10x = 215,515.05 × 81,468.70
  4. Step 4: Simplify right side
    143,871.10x = 17,557,730,953.94
  5. Step 5: Solve for x
    x = 17,557,730,953.94/143,871.10
  6. Step 6: Final answer
    x = 122,037.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.