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Finding the Fourth Proportional to 62.85, 86.70 and 42.11

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Solution

The fourth proportional to 62.85, 86.70 and 42.11 is: 58.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.85 : 86.70 = 42.11 : x
  2. Step 2: Convert to fraction form
    62.85/86.70 = 42.11/x
  3. Step 3: Cross multiply
    62.85x = 86.70 × 42.11
  4. Step 4: Simplify right side
    62.85x = 3,650.50
  5. Step 5: Solve for x
    x = 3,650.50/62.85
  6. Step 6: Final answer
    x = 58.08

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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.