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Finding the Fourth Proportional to 906.60, 1,251.39 and 720.42

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Solution

The fourth proportional to 906.60, 1,251.39 and 720.42 is: 994.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.60 : 1,251.39 = 720.42 : x
  2. Step 2: Convert to fraction form
    906.60/1,251.39 = 720.42/x
  3. Step 3: Cross multiply
    906.60x = 1,251.39 × 720.42
  4. Step 4: Simplify right side
    906.60x = 901,526.38
  5. Step 5: Solve for x
    x = 901,526.38/906.60
  6. Step 6: Final answer
    x = 994.40

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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.