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Finding the Fourth Proportional to 52.74, 78.90 and 43.80

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Solution

The fourth proportional to 52.74, 78.90 and 43.80 is: 65.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.74 : 78.90 = 43.80 : x
  2. Step 2: Convert to fraction form
    52.74/78.90 = 43.80/x
  3. Step 3: Cross multiply
    52.74x = 78.90 × 43.80
  4. Step 4: Simplify right side
    52.74x = 3,455.82
  5. Step 5: Solve for x
    x = 3,455.82/52.74
  6. Step 6: Final answer
    x = 65.53

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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.