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Finding the Fourth Proportional to 60.40, 90.11 and 50.20

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Solution

The fourth proportional to 60.40, 90.11 and 50.20 is: 74.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.40 : 90.11 = 50.20 : x
  2. Step 2: Convert to fraction form
    60.40/90.11 = 50.20/x
  3. Step 3: Cross multiply
    60.40x = 90.11 × 50.20
  4. Step 4: Simplify right side
    60.40x = 4,523.52
  5. Step 5: Solve for x
    x = 4,523.52/60.40
  6. Step 6: Final answer
    x = 74.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.