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Finding the Fourth Proportional to 52.17, 78.39 and 30.57

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Solution

The fourth proportional to 52.17, 78.39 and 30.57 is: 45.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.17 : 78.39 = 30.57 : x
  2. Step 2: Convert to fraction form
    52.17/78.39 = 30.57/x
  3. Step 3: Cross multiply
    52.17x = 78.39 × 30.57
  4. Step 4: Simplify right side
    52.17x = 2,396.38
  5. Step 5: Solve for x
    x = 2,396.38/52.17
  6. Step 6: Final answer
    x = 45.93

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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.