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Finding the Fourth Proportional to 1,442.76, 1,991.12 and 813.28

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Solution

The fourth proportional to 1,442.76, 1,991.12 and 813.28 is: 1,122.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.76 : 1,991.12 = 813.28 : x
  2. Step 2: Convert to fraction form
    1,442.76/1,991.12 = 813.28/x
  3. Step 3: Cross multiply
    1,442.76x = 1,991.12 × 813.28
  4. Step 4: Simplify right side
    1,442.76x = 1,619,338.07
  5. Step 5: Solve for x
    x = 1,619,338.07/1,442.76
  6. Step 6: Final answer
    x = 1,122.39

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Double scale
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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.