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Finding the Fourth Proportional to 50.08, 75.13 and 21.20

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Solution

The fourth proportional to 50.08, 75.13 and 21.20 is: 31.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.08 : 75.13 = 21.20 : x
  2. Step 2: Convert to fraction form
    50.08/75.13 = 21.20/x
  3. Step 3: Cross multiply
    50.08x = 75.13 × 21.20
  4. Step 4: Simplify right side
    50.08x = 1,592.76
  5. Step 5: Solve for x
    x = 1,592.76/50.08
  6. Step 6: Final answer
    x = 31.80

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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.