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Finding the Fourth Proportional to 57, 79.20 and 56.47

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Solution

The fourth proportional to 57, 79.20 and 56.47 is: 78.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    57 : 79.20 = 56.47 : x
  2. Step 2: Convert to fraction form
    57/79.20 = 56.47/x
  3. Step 3: Cross multiply
    57x = 79.20 × 56.47
  4. Step 4: Simplify right side
    57x = 4,472.42
  5. Step 5: Solve for x
    x = 4,472.42/57
  6. Step 6: Final answer
    x = 78.46

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.