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Finding the Fourth Proportional to 155.95, 215.13 and 100.67

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Solution

The fourth proportional to 155.95, 215.13 and 100.67 is: 138.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.95 : 215.13 = 100.67 : x
  2. Step 2: Convert to fraction form
    155.95/215.13 = 100.67/x
  3. Step 3: Cross multiply
    155.95x = 215.13 × 100.67
  4. Step 4: Simplify right side
    155.95x = 21,657.14
  5. Step 5: Solve for x
    x = 21,657.14/155.95
  6. Step 6: Final answer
    x = 138.87

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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.