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Finding the Fourth Proportional to 56.99, 78.71 and 48.76

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Solution

The fourth proportional to 56.99, 78.71 and 48.76 is: 67.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.99 : 78.71 = 48.76 : x
  2. Step 2: Convert to fraction form
    56.99/78.71 = 48.76/x
  3. Step 3: Cross multiply
    56.99x = 78.71 × 48.76
  4. Step 4: Simplify right side
    56.99x = 3,837.46
  5. Step 5: Solve for x
    x = 3,837.46/56.99
  6. Step 6: Final answer
    x = 67.33

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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.