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Finding the Fourth Proportional to 906.84, 1,251.36 and 720.78

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Solution

The fourth proportional to 906.84, 1,251.36 and 720.78 is: 994.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.84 : 1,251.36 = 720.78 : x
  2. Step 2: Convert to fraction form
    906.84/1,251.36 = 720.78/x
  3. Step 3: Cross multiply
    906.84x = 1,251.36 × 720.78
  4. Step 4: Simplify right side
    906.84x = 901,955.26
  5. Step 5: Solve for x
    x = 901,955.26/906.84
  6. Step 6: Final answer
    x = 994.61

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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.