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Finding the Fourth Proportional to 103.02, 154.56 and 42.15

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Solution

The fourth proportional to 103.02, 154.56 and 42.15 is: 63.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.02 : 154.56 = 42.15 : x
  2. Step 2: Convert to fraction form
    103.02/154.56 = 42.15/x
  3. Step 3: Cross multiply
    103.02x = 154.56 × 42.15
  4. Step 4: Simplify right side
    103.02x = 6,515.44
  5. Step 5: Solve for x
    x = 6,515.44/103.02
  6. Step 6: Final answer
    x = 63.25

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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.