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Finding the Fourth Proportional to 52.26, 78.32 and 21.78

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Solution

The fourth proportional to 52.26, 78.32 and 21.78 is: 32.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.26 : 78.32 = 21.78 : x
  2. Step 2: Convert to fraction form
    52.26/78.32 = 21.78/x
  3. Step 3: Cross multiply
    52.26x = 78.32 × 21.78
  4. Step 4: Simplify right side
    52.26x = 1,705.81
  5. Step 5: Solve for x
    x = 1,705.81/52.26
  6. Step 6: Final answer
    x = 32.64

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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.