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Finding the Fourth Proportional to 121,129.20, 181,888.20 and 81,860.40

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Solution

The fourth proportional to 121,129.20, 181,888.20 and 81,860.40 is: 122,921.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,129.20 : 181,888.20 = 81,860.40 : x
  2. Step 2: Convert to fraction form
    121,129.20/181,888.20 = 81,860.40/x
  3. Step 3: Cross multiply
    121,129.20x = 181,888.20 × 81,860.40
  4. Step 4: Simplify right side
    121,129.20x = 14,889,440,807.28
  5. Step 5: Solve for x
    x = 14,889,440,807.28/121,129.20
  6. Step 6: Final answer
    x = 122,921.98

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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.