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Finding the Fourth Proportional to 75.45, 104.12 and 42.70

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Solution

The fourth proportional to 75.45, 104.12 and 42.70 is: 58.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.45 : 104.12 = 42.70 : x
  2. Step 2: Convert to fraction form
    75.45/104.12 = 42.70/x
  3. Step 3: Cross multiply
    75.45x = 104.12 × 42.70
  4. Step 4: Simplify right side
    75.45x = 4,445.81
  5. Step 5: Solve for x
    x = 4,445.81/75.45
  6. Step 6: Final answer
    x = 58.93

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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.