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Finding the Fourth Proportional to 100.08, 138.12 and 55.83

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Solution

The fourth proportional to 100.08, 138.12 and 55.83 is: 77.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.08 : 138.12 = 55.83 : x
  2. Step 2: Convert to fraction form
    100.08/138.12 = 55.83/x
  3. Step 3: Cross multiply
    100.08x = 138.12 × 55.83
  4. Step 4: Simplify right side
    100.08x = 7,710.82
  5. Step 5: Solve for x
    x = 7,710.82/100.08
  6. Step 6: Final answer
    x = 77.04

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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.