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Finding the Fourth Proportional to 125,862.84, 188,881.56 and 81,379.32

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Solution

The fourth proportional to 125,862.84, 188,881.56 and 81,379.32 is: 122,125.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,862.84 : 188,881.56 = 81,379.32 : x
  2. Step 2: Convert to fraction form
    125,862.84/188,881.56 = 81,379.32/x
  3. Step 3: Cross multiply
    125,862.84x = 188,881.56 × 81,379.32
  4. Step 4: Simplify right side
    125,862.84x = 15,371,052,913.34
  5. Step 5: Solve for x
    x = 15,371,052,913.34/125,862.84
  6. Step 6: Final answer
    x = 122,125.43

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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.