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Finding the Fourth Proportional to 242.55, 334.78 and 187.13

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Solution

The fourth proportional to 242.55, 334.78 and 187.13 is: 258.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.55 : 334.78 = 187.13 : x
  2. Step 2: Convert to fraction form
    242.55/334.78 = 187.13/x
  3. Step 3: Cross multiply
    242.55x = 334.78 × 187.13
  4. Step 4: Simplify right side
    242.55x = 62,647.75
  5. Step 5: Solve for x
    x = 62,647.75/242.55
  6. Step 6: Final answer
    x = 258.29

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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.