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Finding the Fourth Proportional to 57.48, 79.36 and 47.20

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Solution

The fourth proportional to 57.48, 79.36 and 47.20 is: 65.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.48 : 79.36 = 47.20 : x
  2. Step 2: Convert to fraction form
    57.48/79.36 = 47.20/x
  3. Step 3: Cross multiply
    57.48x = 79.36 × 47.20
  4. Step 4: Simplify right side
    57.48x = 3,745.79
  5. Step 5: Solve for x
    x = 3,745.79/57.48
  6. Step 6: Final answer
    x = 65.17

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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.