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Finding the Fourth Proportional to 56.32, 77.60 and 39.92

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Solution

The fourth proportional to 56.32, 77.60 and 39.92 is: 55.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.32 : 77.60 = 39.92 : x
  2. Step 2: Convert to fraction form
    56.32/77.60 = 39.92/x
  3. Step 3: Cross multiply
    56.32x = 77.60 × 39.92
  4. Step 4: Simplify right side
    56.32x = 3,097.79
  5. Step 5: Solve for x
    x = 3,097.79/56.32
  6. Step 6: Final answer
    x = 55.00

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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.