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Finding the Fourth Proportional to 956.91, 1,320.62 and 553.26

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Solution

The fourth proportional to 956.91, 1,320.62 and 553.26 is: 763.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.91 : 1,320.62 = 553.26 : x
  2. Step 2: Convert to fraction form
    956.91/1,320.62 = 553.26/x
  3. Step 3: Cross multiply
    956.91x = 1,320.62 × 553.26
  4. Step 4: Simplify right side
    956.91x = 730,648.41
  5. Step 5: Solve for x
    x = 730,648.41/956.91
  6. Step 6: Final answer
    x = 763.55

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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.