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Finding the Fourth Proportional to 956.61, 1,320.30 and 641.25

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Solution

The fourth proportional to 956.61, 1,320.30 and 641.25 is: 885.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.61 : 1,320.30 = 641.25 : x
  2. Step 2: Convert to fraction form
    956.61/1,320.30 = 641.25/x
  3. Step 3: Cross multiply
    956.61x = 1,320.30 × 641.25
  4. Step 4: Simplify right side
    956.61x = 846,642.38
  5. Step 5: Solve for x
    x = 846,642.38/956.61
  6. Step 6: Final answer
    x = 885.04

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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.