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Finding the Fourth Proportional to 61.39, 91.67 and 51.28

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Solution

The fourth proportional to 61.39, 91.67 and 51.28 is: 76.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.39 : 91.67 = 51.28 : x
  2. Step 2: Convert to fraction form
    61.39/91.67 = 51.28/x
  3. Step 3: Cross multiply
    61.39x = 91.67 × 51.28
  4. Step 4: Simplify right side
    61.39x = 4,700.84
  5. Step 5: Solve for x
    x = 4,700.84/61.39
  6. Step 6: Final answer
    x = 76.57

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These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.