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Finding the Fourth Proportional to 148,920.88, 205,511.48 and 81,857.20

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Solution

The fourth proportional to 148,920.88, 205,511.48 and 81,857.20 is: 112,963.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    148,920.88 : 205,511.48 = 81,857.20 : x
  2. Step 2: Convert to fraction form
    148,920.88/205,511.48 = 81,857.20/x
  3. Step 3: Cross multiply
    148,920.88x = 205,511.48 × 81,857.20
  4. Step 4: Simplify right side
    148,920.88x = 16,822,594,320.66
  5. Step 5: Solve for x
    x = 16,822,594,320.66/148,920.88
  6. Step 6: Final answer
    x = 112,963.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.