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Finding the Fourth Proportional to 155.18, 213.90 and 136.10

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Solution

The fourth proportional to 155.18, 213.90 and 136.10 is: 187.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.18 : 213.90 = 136.10 : x
  2. Step 2: Convert to fraction form
    155.18/213.90 = 136.10/x
  3. Step 3: Cross multiply
    155.18x = 213.90 × 136.10
  4. Step 4: Simplify right side
    155.18x = 29,111.79
  5. Step 5: Solve for x
    x = 29,111.79/155.18
  6. Step 6: Final answer
    x = 187.60

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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.