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Finding the Fourth Proportional to 52.78, 72.80 and 36.40

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Solution

The fourth proportional to 52.78, 72.80 and 36.40 is: 50.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.78 : 72.80 = 36.40 : x
  2. Step 2: Convert to fraction form
    52.78/72.80 = 36.40/x
  3. Step 3: Cross multiply
    52.78x = 72.80 × 36.40
  4. Step 4: Simplify right side
    52.78x = 2,649.92
  5. Step 5: Solve for x
    x = 2,649.92/52.78
  6. Step 6: Final answer
    x = 50.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.