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Finding the Fourth Proportional to 123,355.68, 170,143.02 and 85,129.80

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Solution

The fourth proportional to 123,355.68, 170,143.02 and 85,129.80 is: 117,418.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,355.68 : 170,143.02 = 85,129.80 : x
  2. Step 2: Convert to fraction form
    123,355.68/170,143.02 = 85,129.80/x
  3. Step 3: Cross multiply
    123,355.68x = 170,143.02 × 85,129.80
  4. Step 4: Simplify right side
    123,355.68x = 14,484,241,264.00
  5. Step 5: Solve for x
    x = 14,484,241,264.00/123,355.68
  6. Step 6: Final answer
    x = 117,418.52

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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.