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Finding the Fourth Proportional to 901.36, 1,244.15 and 636.49

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Solution

The fourth proportional to 901.36, 1,244.15 and 636.49 is: 878.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.36 : 1,244.15 = 636.49 : x
  2. Step 2: Convert to fraction form
    901.36/1,244.15 = 636.49/x
  3. Step 3: Cross multiply
    901.36x = 1,244.15 × 636.49
  4. Step 4: Simplify right side
    901.36x = 791,889.03
  5. Step 5: Solve for x
    x = 791,889.03/901.36
  6. Step 6: Final answer
    x = 878.55

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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.