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Finding the Fourth Proportional to 62.12, 85.75 and 42.78

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Solution

The fourth proportional to 62.12, 85.75 and 42.78 is: 59.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.12 : 85.75 = 42.78 : x
  2. Step 2: Convert to fraction form
    62.12/85.75 = 42.78/x
  3. Step 3: Cross multiply
    62.12x = 85.75 × 42.78
  4. Step 4: Simplify right side
    62.12x = 3,668.39
  5. Step 5: Solve for x
    x = 3,668.39/62.12
  6. Step 6: Final answer
    x = 59.05

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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.