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Finding the Fourth Proportional to 121,339.79, 181,060.43 and 108,731.42

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Solution

The fourth proportional to 121,339.79, 181,060.43 and 108,731.42 is: 162,246.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,339.79 : 181,060.43 = 108,731.42 : x
  2. Step 2: Convert to fraction form
    121,339.79/181,060.43 = 108,731.42/x
  3. Step 3: Cross multiply
    121,339.79x = 181,060.43 × 108,731.42
  4. Step 4: Simplify right side
    121,339.79x = 19,686,957,659.71
  5. Step 5: Solve for x
    x = 19,686,957,659.71/121,339.79
  6. Step 6: Final answer
    x = 162,246.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.