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Finding the Fourth Proportional to 121,138.20, 181,707.30 and 87,701.40

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Solution

The fourth proportional to 121,138.20, 181,707.30 and 87,701.40 is: 131,552.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,138.20 : 181,707.30 = 87,701.40 : x
  2. Step 2: Convert to fraction form
    121,138.20/181,707.30 = 87,701.40/x
  3. Step 3: Cross multiply
    121,138.20x = 181,707.30 × 87,701.40
  4. Step 4: Simplify right side
    121,138.20x = 15,935,984,600.22
  5. Step 5: Solve for x
    x = 15,935,984,600.22/121,138.20
  6. Step 6: Final answer
    x = 131,552.10

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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.