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Finding the Fourth Proportional to 103.57, 155.40 and 58

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Solution

The fourth proportional to 103.57, 155.40 and 58 is: 87.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.57 : 155.40 = 58 : x
  2. Step 2: Convert to fraction form
    103.57/155.40 = 58/x
  3. Step 3: Cross multiply
    103.57x = 155.40 × 58
  4. Step 4: Simplify right side
    103.57x = 9,013.20
  5. Step 5: Solve for x
    x = 9,013.20/103.57
  6. Step 6: Final answer
    x = 87.03

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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.