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Finding the Fourth Proportional to 814.24, 1,121.40 and 703.68

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Solution

The fourth proportional to 814.24, 1,121.40 and 703.68 is: 969.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.24 : 1,121.40 = 703.68 : x
  2. Step 2: Convert to fraction form
    814.24/1,121.40 = 703.68/x
  3. Step 3: Cross multiply
    814.24x = 1,121.40 × 703.68
  4. Step 4: Simplify right side
    814.24x = 789,106.75
  5. Step 5: Solve for x
    x = 789,106.75/814.24
  6. Step 6: Final answer
    x = 969.13

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Double scale
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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.