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Finding the Fourth Proportional to 564.38, 778.87 and 315.70

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Solution

The fourth proportional to 564.38, 778.87 and 315.70 is: 435.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.38 : 778.87 = 315.70 : x
  2. Step 2: Convert to fraction form
    564.38/778.87 = 315.70/x
  3. Step 3: Cross multiply
    564.38x = 778.87 × 315.70
  4. Step 4: Simplify right side
    564.38x = 245,885.93
  5. Step 5: Solve for x
    x = 245,885.93/564.38
  6. Step 6: Final answer
    x = 435.67

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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.