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Finding the Fourth Proportional to 57.76, 79.72 and 47.39

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Solution

The fourth proportional to 57.76, 79.72 and 47.39 is: 65.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.76 : 79.72 = 47.39 : x
  2. Step 2: Convert to fraction form
    57.76/79.72 = 47.39/x
  3. Step 3: Cross multiply
    57.76x = 79.72 × 47.39
  4. Step 4: Simplify right side
    57.76x = 3,777.41
  5. Step 5: Solve for x
    x = 3,777.41/57.76
  6. Step 6: Final answer
    x = 65.40

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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.