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Finding the Fourth Proportional to 52.55, 78.38 and 47.69

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Solution

The fourth proportional to 52.55, 78.38 and 47.69 is: 71.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.55 : 78.38 = 47.69 : x
  2. Step 2: Convert to fraction form
    52.55/78.38 = 47.69/x
  3. Step 3: Cross multiply
    52.55x = 78.38 × 47.69
  4. Step 4: Simplify right side
    52.55x = 3,737.94
  5. Step 5: Solve for x
    x = 3,737.94/52.55
  6. Step 6: Final answer
    x = 71.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.