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Finding the Fourth Proportional to 121,029.40, 181,544.10 and 68,541.40

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Solution

The fourth proportional to 121,029.40, 181,544.10 and 68,541.40 is: 102,812.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,029.40 : 181,544.10 = 68,541.40 : x
  2. Step 2: Convert to fraction form
    121,029.40/181,544.10 = 68,541.40/x
  3. Step 3: Cross multiply
    121,029.40x = 181,544.10 × 68,541.40
  4. Step 4: Simplify right side
    121,029.40x = 12,443,286,775.74
  5. Step 5: Solve for x
    x = 12,443,286,775.74/121,029.40
  6. Step 6: Final answer
    x = 102,812.10

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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.