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Finding the Fourth Proportional to 906.86, 1,251.20 and 528.68

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Solution

The fourth proportional to 906.86, 1,251.20 and 528.68 is: 729.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.86 : 1,251.20 = 528.68 : x
  2. Step 2: Convert to fraction form
    906.86/1,251.20 = 528.68/x
  3. Step 3: Cross multiply
    906.86x = 1,251.20 × 528.68
  4. Step 4: Simplify right side
    906.86x = 661,488.87
  5. Step 5: Solve for x
    x = 661,488.87/906.86
  6. Step 6: Final answer
    x = 729.43

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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.