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Finding the Fourth Proportional to 52.15, 78.30 and 21.77

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Solution

The fourth proportional to 52.15, 78.30 and 21.77 is: 32.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.15 : 78.30 = 21.77 : x
  2. Step 2: Convert to fraction form
    52.15/78.30 = 21.77/x
  3. Step 3: Cross multiply
    52.15x = 78.30 × 21.77
  4. Step 4: Simplify right side
    52.15x = 1,704.93
  5. Step 5: Solve for x
    x = 1,704.93/52.15
  6. Step 6: Final answer
    x = 32.69

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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.