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Finding the Fourth Proportional to 60.86, 83.99 and 40.20

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Solution

The fourth proportional to 60.86, 83.99 and 40.20 is: 55.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.86 : 83.99 = 40.20 : x
  2. Step 2: Convert to fraction form
    60.86/83.99 = 40.20/x
  3. Step 3: Cross multiply
    60.86x = 83.99 × 40.20
  4. Step 4: Simplify right side
    60.86x = 3,376.40
  5. Step 5: Solve for x
    x = 3,376.40/60.86
  6. Step 6: Final answer
    x = 55.48

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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.