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Finding the Fourth Proportional to 60.79, 83.86 and 40.09

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Solution

The fourth proportional to 60.79, 83.86 and 40.09 is: 55.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.79 : 83.86 = 40.09 : x
  2. Step 2: Convert to fraction form
    60.79/83.86 = 40.09/x
  3. Step 3: Cross multiply
    60.79x = 83.86 × 40.09
  4. Step 4: Simplify right side
    60.79x = 3,361.95
  5. Step 5: Solve for x
    x = 3,361.95/60.79
  6. Step 6: Final answer
    x = 55.30

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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.