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Finding the Fourth Proportional to 155.68, 214.70 and 100.42

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Solution

The fourth proportional to 155.68, 214.70 and 100.42 is: 138.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.68 : 214.70 = 100.42 : x
  2. Step 2: Convert to fraction form
    155.68/214.70 = 100.42/x
  3. Step 3: Cross multiply
    155.68x = 214.70 × 100.42
  4. Step 4: Simplify right side
    155.68x = 21,560.17
  5. Step 5: Solve for x
    x = 21,560.17/155.68
  6. Step 6: Final answer
    x = 138.49

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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.