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Finding the Fourth Proportional to 121,013.90, 181,520.85 and 65,717.90

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Solution

The fourth proportional to 121,013.90, 181,520.85 and 65,717.90 is: 98,576.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,013.90 : 181,520.85 = 65,717.90 : x
  2. Step 2: Convert to fraction form
    121,013.90/181,520.85 = 65,717.90/x
  3. Step 3: Cross multiply
    121,013.90x = 181,520.85 × 65,717.90
  4. Step 4: Simplify right side
    121,013.90x = 11,929,169,068.22
  5. Step 5: Solve for x
    x = 11,929,169,068.22/121,013.90
  6. Step 6: Final answer
    x = 98,576.85

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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.