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Finding the Fourth Proportional to 155.38, 214.37 and 89.86

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Solution

The fourth proportional to 155.38, 214.37 and 89.86 is: 123.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.38 : 214.37 = 89.86 : x
  2. Step 2: Convert to fraction form
    155.38/214.37 = 89.86/x
  3. Step 3: Cross multiply
    155.38x = 214.37 × 89.86
  4. Step 4: Simplify right side
    155.38x = 19,261.77
  5. Step 5: Solve for x
    x = 19,261.77/155.38
  6. Step 6: Final answer
    x = 123.97

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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.