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Finding the Fourth Proportional to 564.32, 778.79 and 315.67

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Solution

The fourth proportional to 564.32, 778.79 and 315.67 is: 435.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.32 : 778.79 = 315.67 : x
  2. Step 2: Convert to fraction form
    564.32/778.79 = 315.67/x
  3. Step 3: Cross multiply
    564.32x = 778.79 × 315.67
  4. Step 4: Simplify right side
    564.32x = 245,840.64
  5. Step 5: Solve for x
    x = 245,840.64/564.32
  6. Step 6: Final answer
    x = 435.64

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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.