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Finding the Fourth Proportional to 121,135.20, 181,702.80 and 54,650.40

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Solution

The fourth proportional to 121,135.20, 181,702.80 and 54,650.40 is: 81,975.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,135.20 : 181,702.80 = 54,650.40 : x
  2. Step 2: Convert to fraction form
    121,135.20/181,702.80 = 54,650.40/x
  3. Step 3: Cross multiply
    121,135.20x = 181,702.80 × 54,650.40
  4. Step 4: Simplify right side
    121,135.20x = 9,930,130,701.12
  5. Step 5: Solve for x
    x = 9,930,130,701.12/121,135.20
  6. Step 6: Final answer
    x = 81,975.60

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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.