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Finding the Fourth Proportional to 56.46, 77.92 and 39

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Solution

The fourth proportional to 56.46, 77.92 and 39 is: 53.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.46 : 77.92 = 39 : x
  2. Step 2: Convert to fraction form
    56.46/77.92 = 39/x
  3. Step 3: Cross multiply
    56.46x = 77.92 × 39
  4. Step 4: Simplify right side
    56.46x = 3,038.88
  5. Step 5: Solve for x
    x = 3,038.88/56.46
  6. Step 6: Final answer
    x = 53.82

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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.