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Finding the Fourth Proportional to 155.95, 215.14 and 100.69

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Solution

The fourth proportional to 155.95, 215.14 and 100.69 is: 138.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.95 : 215.14 = 100.69 : x
  2. Step 2: Convert to fraction form
    155.95/215.14 = 100.69/x
  3. Step 3: Cross multiply
    155.95x = 215.14 × 100.69
  4. Step 4: Simplify right side
    155.95x = 21,663.48
  5. Step 5: Solve for x
    x = 21,663.48/155.95
  6. Step 6: Final answer
    x = 138.91

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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.