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Finding the Fourth Proportional to 103.40, 155.12 and 42.51

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Solution

The fourth proportional to 103.40, 155.12 and 42.51 is: 63.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.40 : 155.12 = 42.51 : x
  2. Step 2: Convert to fraction form
    103.40/155.12 = 42.51/x
  3. Step 3: Cross multiply
    103.40x = 155.12 × 42.51
  4. Step 4: Simplify right side
    103.40x = 6,593.94
  5. Step 5: Solve for x
    x = 6,593.94/103.40
  6. Step 6: Final answer
    x = 63.77

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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.