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Finding the Fourth Proportional to 56.99, 78.61 and 55.97

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Solution

The fourth proportional to 56.99, 78.61 and 55.97 is: 77.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.99 : 78.61 = 55.97 : x
  2. Step 2: Convert to fraction form
    56.99/78.61 = 55.97/x
  3. Step 3: Cross multiply
    56.99x = 78.61 × 55.97
  4. Step 4: Simplify right side
    56.99x = 4,399.27
  5. Step 5: Solve for x
    x = 4,399.27/56.99
  6. Step 6: Final answer
    x = 77.20

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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.