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Finding the Fourth Proportional to 57.14, 78.74 and 40.76

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Solution

The fourth proportional to 57.14, 78.74 and 40.76 is: 56.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.14 : 78.74 = 40.76 : x
  2. Step 2: Convert to fraction form
    57.14/78.74 = 40.76/x
  3. Step 3: Cross multiply
    57.14x = 78.74 × 40.76
  4. Step 4: Simplify right side
    57.14x = 3,209.15
  5. Step 5: Solve for x
    x = 3,209.15/57.14
  6. Step 6: Final answer
    x = 56.17

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Find fourth proportional to 28.57, 39.37 and 20.38
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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.