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Finding the Fourth Proportional to 121,209.40, 181,814.10 and 68,721.40

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Solution

The fourth proportional to 121,209.40, 181,814.10 and 68,721.40 is: 103,082.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,209.40 : 181,814.10 = 68,721.40 : x
  2. Step 2: Convert to fraction form
    121,209.40/181,814.10 = 68,721.40/x
  3. Step 3: Cross multiply
    121,209.40x = 181,814.10 × 68,721.40
  4. Step 4: Simplify right side
    121,209.40x = 12,494,519,491.74
  5. Step 5: Solve for x
    x = 12,494,519,491.74/121,209.40
  6. Step 6: Final answer
    x = 103,082.10

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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.