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Finding the Fourth Proportional to 754.19, 1,040.25 and 692.22

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Solution

The fourth proportional to 754.19, 1,040.25 and 692.22 is: 954.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.19 : 1,040.25 = 692.22 : x
  2. Step 2: Convert to fraction form
    754.19/1,040.25 = 692.22/x
  3. Step 3: Cross multiply
    754.19x = 1,040.25 × 692.22
  4. Step 4: Simplify right side
    754.19x = 720,081.86
  5. Step 5: Solve for x
    x = 720,081.86/754.19
  6. Step 6: Final answer
    x = 954.78

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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.