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Finding the Fourth Proportional to 956.75, 1,320.10 and 691.58

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Solution

The fourth proportional to 956.75, 1,320.10 and 691.58 is: 954.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.75 : 1,320.10 = 691.58 : x
  2. Step 2: Convert to fraction form
    956.75/1,320.10 = 691.58/x
  3. Step 3: Cross multiply
    956.75x = 1,320.10 × 691.58
  4. Step 4: Simplify right side
    956.75x = 912,956.33
  5. Step 5: Solve for x
    x = 912,956.33/956.75
  6. Step 6: Final answer
    x = 954.22

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1.5x scale

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.