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Finding the Fourth Proportional to 121,143.40, 181,715.10 and 68,655.40

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Solution

The fourth proportional to 121,143.40, 181,715.10 and 68,655.40 is: 102,983.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,143.40 : 181,715.10 = 68,655.40 : x
  2. Step 2: Convert to fraction form
    121,143.40/181,715.10 = 68,655.40/x
  3. Step 3: Cross multiply
    121,143.40x = 181,715.10 × 68,655.40
  4. Step 4: Simplify right side
    121,143.40x = 12,475,722,876.54
  5. Step 5: Solve for x
    x = 12,475,722,876.54/121,143.40
  6. Step 6: Final answer
    x = 102,983.10

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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.