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Finding the Fourth Proportional to 645.67, 970.22 and 353.35

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Solution

The fourth proportional to 645.67, 970.22 and 353.35 is: 530.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.67 : 970.22 = 353.35 : x
  2. Step 2: Convert to fraction form
    645.67/970.22 = 353.35/x
  3. Step 3: Cross multiply
    645.67x = 970.22 × 353.35
  4. Step 4: Simplify right side
    645.67x = 342,827.24
  5. Step 5: Solve for x
    x = 342,827.24/645.67
  6. Step 6: Final answer
    x = 530.96

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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.