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Finding the Fourth Proportional to 956.70, 1,319.41 and 691.07

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Solution

The fourth proportional to 956.70, 1,319.41 and 691.07 is: 953.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.70 : 1,319.41 = 691.07 : x
  2. Step 2: Convert to fraction form
    956.70/1,319.41 = 691.07/x
  3. Step 3: Cross multiply
    956.70x = 1,319.41 × 691.07
  4. Step 4: Simplify right side
    956.70x = 911,801.21
  5. Step 5: Solve for x
    x = 911,801.21/956.70
  6. Step 6: Final answer
    x = 953.07

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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.