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Finding the Fourth Proportional to 916.57, 1,372.58 and 641.37

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Solution

The fourth proportional to 916.57, 1,372.58 and 641.37 is: 960.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.57 : 1,372.58 = 641.37 : x
  2. Step 2: Convert to fraction form
    916.57/1,372.58 = 641.37/x
  3. Step 3: Cross multiply
    916.57x = 1,372.58 × 641.37
  4. Step 4: Simplify right side
    916.57x = 880,335.98
  5. Step 5: Solve for x
    x = 880,335.98/916.57
  6. Step 6: Final answer
    x = 960.47

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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.