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Finding the Fourth Proportional to 71.49, 98.60 and 57.67

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Solution

The fourth proportional to 71.49, 98.60 and 57.67 is: 79.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.49 : 98.60 = 57.67 : x
  2. Step 2: Convert to fraction form
    71.49/98.60 = 57.67/x
  3. Step 3: Cross multiply
    71.49x = 98.60 × 57.67
  4. Step 4: Simplify right side
    71.49x = 5,686.61
  5. Step 5: Solve for x
    x = 5,686.61/71.49
  6. Step 6: Final answer
    x = 79.54

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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.