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Finding the Fourth Proportional to 43.28, 59.70 and 30.98

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Solution

The fourth proportional to 43.28, 59.70 and 30.98 is: 42.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.28 : 59.70 = 30.98 : x
  2. Step 2: Convert to fraction form
    43.28/59.70 = 30.98/x
  3. Step 3: Cross multiply
    43.28x = 59.70 × 30.98
  4. Step 4: Simplify right side
    43.28x = 1,849.51
  5. Step 5: Solve for x
    x = 1,849.51/43.28
  6. Step 6: Final answer
    x = 42.73

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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.