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Finding the Fourth Proportional to 73.76, 101.76 and 56.48

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Solution

The fourth proportional to 73.76, 101.76 and 56.48 is: 77.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.76 : 101.76 = 56.48 : x
  2. Step 2: Convert to fraction form
    73.76/101.76 = 56.48/x
  3. Step 3: Cross multiply
    73.76x = 101.76 × 56.48
  4. Step 4: Simplify right side
    73.76x = 5,747.40
  5. Step 5: Solve for x
    x = 5,747.40/73.76
  6. Step 6: Final answer
    x = 77.92

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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.