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Finding the Fourth Proportional to 60.40, 90.51 and 55

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Solution

The fourth proportional to 60.40, 90.51 and 55 is: 82.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.40 : 90.51 = 55 : x
  2. Step 2: Convert to fraction form
    60.40/90.51 = 55/x
  3. Step 3: Cross multiply
    60.40x = 90.51 × 55
  4. Step 4: Simplify right side
    60.40x = 4,978.05
  5. Step 5: Solve for x
    x = 4,978.05/60.40
  6. Step 6: Final answer
    x = 82.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.