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Finding the Fourth Proportional to 155.21, 214.13 and 124.20

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Solution

The fourth proportional to 155.21, 214.13 and 124.20 is: 171.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.21 : 214.13 = 124.20 : x
  2. Step 2: Convert to fraction form
    155.21/214.13 = 124.20/x
  3. Step 3: Cross multiply
    155.21x = 214.13 × 124.20
  4. Step 4: Simplify right side
    155.21x = 26,594.33
  5. Step 5: Solve for x
    x = 26,594.33/155.21
  6. Step 6: Final answer
    x = 171.35

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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.