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Finding the Fourth Proportional to 956.86, 1,319.62 and 691.23

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Solution

The fourth proportional to 956.86, 1,319.62 and 691.23 is: 953.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.86 : 1,319.62 = 691.23 : x
  2. Step 2: Convert to fraction form
    956.86/1,319.62 = 691.23/x
  3. Step 3: Cross multiply
    956.86x = 1,319.62 × 691.23
  4. Step 4: Simplify right side
    956.86x = 912,160.93
  5. Step 5: Solve for x
    x = 912,160.93/956.86
  6. Step 6: Final answer
    x = 953.29

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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.