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Finding the Fourth Proportional to 28.42, 42.65 and 14.90

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Solution

The fourth proportional to 28.42, 42.65 and 14.90 is: 22.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.42 : 42.65 = 14.90 : x
  2. Step 2: Convert to fraction form
    28.42/42.65 = 14.90/x
  3. Step 3: Cross multiply
    28.42x = 42.65 × 14.90
  4. Step 4: Simplify right side
    28.42x = 635.25
  5. Step 5: Solve for x
    x = 635.25/28.42
  6. Step 6: Final answer
    x = 22.35

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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.