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Finding the Fourth Proportional to 100,692.64, 138,959.40 and 55,374.04

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Solution

The fourth proportional to 100,692.64, 138,959.40 and 55,374.04 is: 76,418.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,692.64 : 138,959.40 = 55,374.04 : x
  2. Step 2: Convert to fraction form
    100,692.64/138,959.40 = 55,374.04/x
  3. Step 3: Cross multiply
    100,692.64x = 138,959.40 × 55,374.04
  4. Step 4: Simplify right side
    100,692.64x = 7,694,743,373.98
  5. Step 5: Solve for x
    x = 7,694,743,373.98/100,692.64
  6. Step 6: Final answer
    x = 76,418.13

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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.