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Finding the Fourth Proportional to 62.78, 86.63 and 40.91

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Solution

The fourth proportional to 62.78, 86.63 and 40.91 is: 56.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.78 : 86.63 = 40.91 : x
  2. Step 2: Convert to fraction form
    62.78/86.63 = 40.91/x
  3. Step 3: Cross multiply
    62.78x = 86.63 × 40.91
  4. Step 4: Simplify right side
    62.78x = 3,543.40
  5. Step 5: Solve for x
    x = 3,543.40/62.78
  6. Step 6: Final answer
    x = 56.45

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