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Finding the Fourth Proportional to 121,154.40, 181,512.90 and 113,281.20

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Solution

The fourth proportional to 121,154.40, 181,512.90 and 113,281.20 is: 169,717.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,154.40 : 181,512.90 = 113,281.20 : x
  2. Step 2: Convert to fraction form
    121,154.40/181,512.90 = 113,281.20/x
  3. Step 3: Cross multiply
    121,154.40x = 181,512.90 × 113,281.20
  4. Step 4: Simplify right side
    121,154.40x = 20,561,999,127.48
  5. Step 5: Solve for x
    x = 20,561,999,127.48/121,154.40
  6. Step 6: Final answer
    x = 169,717.31

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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.