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Finding the Fourth Proportional to 155.71, 214.63 and 124.57

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Solution

The fourth proportional to 155.71, 214.63 and 124.57 is: 171.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.71 : 214.63 = 124.57 : x
  2. Step 2: Convert to fraction form
    155.71/214.63 = 124.57/x
  3. Step 3: Cross multiply
    155.71x = 214.63 × 124.57
  4. Step 4: Simplify right side
    155.71x = 26,736.46
  5. Step 5: Solve for x
    x = 26,736.46/155.71
  6. Step 6: Final answer
    x = 171.71

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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.