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Finding the Fourth Proportional to 1,308.57, 1,806.99 and 956.49

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Solution

The fourth proportional to 1,308.57, 1,806.99 and 956.49 is: 1,320.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.57 : 1,806.99 = 956.49 : x
  2. Step 2: Convert to fraction form
    1,308.57/1,806.99 = 956.49/x
  3. Step 3: Cross multiply
    1,308.57x = 1,806.99 × 956.49
  4. Step 4: Simplify right side
    1,308.57x = 1,728,367.87
  5. Step 5: Solve for x
    x = 1,728,367.87/1,308.57
  6. Step 6: Final answer
    x = 1,320.81

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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.