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Finding the Fourth Proportional to 61.16, 91.72 and 39.76

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Solution

The fourth proportional to 61.16, 91.72 and 39.76 is: 59.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.16 : 91.72 = 39.76 : x
  2. Step 2: Convert to fraction form
    61.16/91.72 = 39.76/x
  3. Step 3: Cross multiply
    61.16x = 91.72 × 39.76
  4. Step 4: Simplify right side
    61.16x = 3,646.79
  5. Step 5: Solve for x
    x = 3,646.79/61.16
  6. Step 6: Final answer
    x = 59.63

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