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Finding the Fourth Proportional to 100,692.64, 138,953.57 and 54,751.28

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Solution

The fourth proportional to 100,692.64, 138,953.57 and 54,751.28 is: 75,555.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,692.64 : 138,953.57 = 54,751.28 : x
  2. Step 2: Convert to fraction form
    100,692.64/138,953.57 = 54,751.28/x
  3. Step 3: Cross multiply
    100,692.64x = 138,953.57 × 54,751.28
  4. Step 4: Simplify right side
    100,692.64x = 7,607,885,891.70
  5. Step 5: Solve for x
    x = 7,607,885,891.70/100,692.64
  6. Step 6: Final answer
    x = 75,555.53

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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.