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Finding the Fourth Proportional to 100,692.49, 138,921.03 and 62,438.26

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Solution

The fourth proportional to 100,692.49, 138,921.03 and 62,438.26 is: 86,143.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,692.49 : 138,921.03 = 62,438.26 : x
  2. Step 2: Convert to fraction form
    100,692.49/138,921.03 = 62,438.26/x
  3. Step 3: Cross multiply
    100,692.49x = 138,921.03 × 62,438.26
  4. Step 4: Simplify right side
    100,692.49x = 8,673,987,390.61
  5. Step 5: Solve for x
    x = 8,673,987,390.61/100,692.49
  6. Step 6: Final answer
    x = 86,143.34

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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.