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Finding the Fourth Proportional to 916.20, 1,370.97 and 641.70

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Solution

The fourth proportional to 916.20, 1,370.97 and 641.70 is: 960.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.20 : 1,370.97 = 641.70 : x
  2. Step 2: Convert to fraction form
    916.20/1,370.97 = 641.70/x
  3. Step 3: Cross multiply
    916.20x = 1,370.97 × 641.70
  4. Step 4: Simplify right side
    916.20x = 879,751.45
  5. Step 5: Solve for x
    x = 879,751.45/916.20
  6. Step 6: Final answer
    x = 960.22

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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.