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Finding the Fourth Proportional to 813.59, 1,123.25 and 626.70

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Solution

The fourth proportional to 813.59, 1,123.25 and 626.70 is: 865.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.59 : 1,123.25 = 626.70 : x
  2. Step 2: Convert to fraction form
    813.59/1,123.25 = 626.70/x
  3. Step 3: Cross multiply
    813.59x = 1,123.25 × 626.70
  4. Step 4: Simplify right side
    813.59x = 703,940.78
  5. Step 5: Solve for x
    x = 703,940.78/813.59
  6. Step 6: Final answer
    x = 865.23

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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.