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Finding the Fourth Proportional to 52.25, 78.21 and 28.13

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Solution

The fourth proportional to 52.25, 78.21 and 28.13 is: 42.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.25 : 78.21 = 28.13 : x
  2. Step 2: Convert to fraction form
    52.25/78.21 = 28.13/x
  3. Step 3: Cross multiply
    52.25x = 78.21 × 28.13
  4. Step 4: Simplify right side
    52.25x = 2,199.66
  5. Step 5: Solve for x
    x = 2,199.66/52.25
  6. Step 6: Final answer
    x = 42.10

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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.