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Finding the Fourth Proportional to 128,516.10, 192,774.15 and 86,525.70

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Solution

The fourth proportional to 128,516.10, 192,774.15 and 86,525.70 is: 129,788.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,516.10 : 192,774.15 = 86,525.70 : x
  2. Step 2: Convert to fraction form
    128,516.10/192,774.15 = 86,525.70/x
  3. Step 3: Cross multiply
    128,516.10x = 192,774.15 × 86,525.70
  4. Step 4: Simplify right side
    128,516.10x = 16,679,918,270.66
  5. Step 5: Solve for x
    x = 16,679,918,270.66/128,516.10
  6. Step 6: Final answer
    x = 129,788.55

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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.