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Finding the Fourth Proportional to 56.16, 77.47 and 39.79

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Solution

The fourth proportional to 56.16, 77.47 and 39.79 is: 54.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.16 : 77.47 = 39.79 : x
  2. Step 2: Convert to fraction form
    56.16/77.47 = 39.79/x
  3. Step 3: Cross multiply
    56.16x = 77.47 × 39.79
  4. Step 4: Simplify right side
    56.16x = 3,082.60
  5. Step 5: Solve for x
    x = 3,082.60/56.16
  6. Step 6: Final answer
    x = 54.89

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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.