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Finding the Fourth Proportional to 61.37, 91.98 and 39.72

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Solution

The fourth proportional to 61.37, 91.98 and 39.72 is: 59.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.37 : 91.98 = 39.72 : x
  2. Step 2: Convert to fraction form
    61.37/91.98 = 39.72/x
  3. Step 3: Cross multiply
    61.37x = 91.98 × 39.72
  4. Step 4: Simplify right side
    61.37x = 3,653.79
  5. Step 5: Solve for x
    x = 3,653.79/61.37
  6. Step 6: Final answer
    x = 59.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.