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Finding the Fourth Proportional to 155.21, 214.40 and 124.07

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Solution

The fourth proportional to 155.21, 214.40 and 124.07 is: 171.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.21 : 214.40 = 124.07 : x
  2. Step 2: Convert to fraction form
    155.21/214.40 = 124.07/x
  3. Step 3: Cross multiply
    155.21x = 214.40 × 124.07
  4. Step 4: Simplify right side
    155.21x = 26,598.92
  5. Step 5: Solve for x
    x = 26,598.92/155.21
  6. Step 6: Final answer
    x = 171.38

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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.