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Finding the Fourth Proportional to 155.67, 214.80 and 90.18

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Solution

The fourth proportional to 155.67, 214.80 and 90.18 is: 124.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.67 : 214.80 = 90.18 : x
  2. Step 2: Convert to fraction form
    155.67/214.80 = 90.18/x
  3. Step 3: Cross multiply
    155.67x = 214.80 × 90.18
  4. Step 4: Simplify right side
    155.67x = 19,370.66
  5. Step 5: Solve for x
    x = 19,370.66/155.67
  6. Step 6: Final answer
    x = 124.43

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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.