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Finding the Fourth Proportional to 906.29, 1,250.65 and 640.45

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Solution

The fourth proportional to 906.29, 1,250.65 and 640.45 is: 883.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.29 : 1,250.65 = 640.45 : x
  2. Step 2: Convert to fraction form
    906.29/1,250.65 = 640.45/x
  3. Step 3: Cross multiply
    906.29x = 1,250.65 × 640.45
  4. Step 4: Simplify right side
    906.29x = 800,981.16
  5. Step 5: Solve for x
    x = 800,981.16/906.29
  6. Step 6: Final answer
    x = 883.80

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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.