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Finding the Fourth Proportional to 56.57, 84.84 and 30.90

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Solution

The fourth proportional to 56.57, 84.84 and 30.90 is: 46.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.57 : 84.84 = 30.90 : x
  2. Step 2: Convert to fraction form
    56.57/84.84 = 30.90/x
  3. Step 3: Cross multiply
    56.57x = 84.84 × 30.90
  4. Step 4: Simplify right side
    56.57x = 2,621.40
  5. Step 5: Solve for x
    x = 2,621.40/56.57
  6. Step 6: Final answer
    x = 46.34

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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.