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Finding the Fourth Proportional to 56.40, 84.49 and 30.68

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Solution

The fourth proportional to 56.40, 84.49 and 30.68 is: 45.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.40 : 84.49 = 30.68 : x
  2. Step 2: Convert to fraction form
    56.40/84.49 = 30.68/x
  3. Step 3: Cross multiply
    56.40x = 84.49 × 30.68
  4. Step 4: Simplify right side
    56.40x = 2,592.29
  5. Step 5: Solve for x
    x = 2,592.29/56.40
  6. Step 6: Final answer
    x = 45.96

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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.