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Finding the Fourth Proportional to 102.55, 153.78 and 41.70

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Solution

The fourth proportional to 102.55, 153.78 and 41.70 is: 62.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.55 : 153.78 = 41.70 : x
  2. Step 2: Convert to fraction form
    102.55/153.78 = 41.70/x
  3. Step 3: Cross multiply
    102.55x = 153.78 × 41.70
  4. Step 4: Simplify right side
    102.55x = 6,412.63
  5. Step 5: Solve for x
    x = 6,412.63/102.55
  6. Step 6: Final answer
    x = 62.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.