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Finding the Fourth Proportional to 64.28, 95.89 and 56.76

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Solution

The fourth proportional to 64.28, 95.89 and 56.76 is: 84.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.28 : 95.89 = 56.76 : x
  2. Step 2: Convert to fraction form
    64.28/95.89 = 56.76/x
  3. Step 3: Cross multiply
    64.28x = 95.89 × 56.76
  4. Step 4: Simplify right side
    64.28x = 5,442.72
  5. Step 5: Solve for x
    x = 5,442.72/64.28
  6. Step 6: Final answer
    x = 84.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.