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Finding the Fourth Proportional to 57.40, 86.10 and 47.28

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Solution

The fourth proportional to 57.40, 86.10 and 47.28 is: 70.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.40 : 86.10 = 47.28 : x
  2. Step 2: Convert to fraction form
    57.40/86.10 = 47.28/x
  3. Step 3: Cross multiply
    57.40x = 86.10 × 47.28
  4. Step 4: Simplify right side
    57.40x = 4,070.81
  5. Step 5: Solve for x
    x = 4,070.81/57.40
  6. Step 6: Final answer
    x = 70.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.