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Finding the Fourth Proportional to 75.15, 103.74 and 58.52

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Solution

The fourth proportional to 75.15, 103.74 and 58.52 is: 80.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.15 : 103.74 = 58.52 : x
  2. Step 2: Convert to fraction form
    75.15/103.74 = 58.52/x
  3. Step 3: Cross multiply
    75.15x = 103.74 × 58.52
  4. Step 4: Simplify right side
    75.15x = 6,070.61
  5. Step 5: Solve for x
    x = 6,070.61/75.15
  6. Step 6: Final answer
    x = 80.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.