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Finding the Fourth Proportional to 102.59, 153.90 and 38.45

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Solution

The fourth proportional to 102.59, 153.90 and 38.45 is: 57.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.59 : 153.90 = 38.45 : x
  2. Step 2: Convert to fraction form
    102.59/153.90 = 38.45/x
  3. Step 3: Cross multiply
    102.59x = 153.90 × 38.45
  4. Step 4: Simplify right side
    102.59x = 5,917.26
  5. Step 5: Solve for x
    x = 5,917.26/102.59
  6. Step 6: Final answer
    x = 57.68

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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.