Home / 1,328.20-1,991.12-635.11

Finding the Fourth Proportional to 1,328.20, 1,991.12 and 635.11

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Solution

The fourth proportional to 1,328.20, 1,991.12 and 635.11 is: 952.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.20 : 1,991.12 = 635.11 : x
  2. Step 2: Convert to fraction form
    1,328.20/1,991.12 = 635.11/x
  3. Step 3: Cross multiply
    1,328.20x = 1,991.12 × 635.11
  4. Step 4: Simplify right side
    1,328.20x = 1,264,572.07
  5. Step 5: Solve for x
    x = 1,264,572.07/1,328.20
  6. Step 6: Final answer
    x = 952.10

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.