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Finding the Fourth Proportional to 906.74, 1,251.33 and 641.66

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Solution

The fourth proportional to 906.74, 1,251.33 and 641.66 is: 885.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.74 : 1,251.33 = 641.66 : x
  2. Step 2: Convert to fraction form
    906.74/1,251.33 = 641.66/x
  3. Step 3: Cross multiply
    906.74x = 1,251.33 × 641.66
  4. Step 4: Simplify right side
    906.74x = 802,923.35
  5. Step 5: Solve for x
    x = 802,923.35/906.74
  6. Step 6: Final answer
    x = 885.50

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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.