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Finding the Fourth Proportional to 52.81, 72.88 and 30.98

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Solution

The fourth proportional to 52.81, 72.88 and 30.98 is: 42.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.81 : 72.88 = 30.98 : x
  2. Step 2: Convert to fraction form
    52.81/72.88 = 30.98/x
  3. Step 3: Cross multiply
    52.81x = 72.88 × 30.98
  4. Step 4: Simplify right side
    52.81x = 2,257.46
  5. Step 5: Solve for x
    x = 2,257.46/52.81
  6. Step 6: Final answer
    x = 42.75

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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.