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Finding the Fourth Proportional to 75.63, 104.34 and 42.87

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Solution

The fourth proportional to 75.63, 104.34 and 42.87 is: 59.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.63 : 104.34 = 42.87 : x
  2. Step 2: Convert to fraction form
    75.63/104.34 = 42.87/x
  3. Step 3: Cross multiply
    75.63x = 104.34 × 42.87
  4. Step 4: Simplify right side
    75.63x = 4,473.06
  5. Step 5: Solve for x
    x = 4,473.06/75.63
  6. Step 6: Final answer
    x = 59.14

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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.