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Finding the Fourth Proportional to 1,408.68, 1,943.96 and 811.22

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Solution

The fourth proportional to 1,408.68, 1,943.96 and 811.22 is: 1,119.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.68 : 1,943.96 = 811.22 : x
  2. Step 2: Convert to fraction form
    1,408.68/1,943.96 = 811.22/x
  3. Step 3: Cross multiply
    1,408.68x = 1,943.96 × 811.22
  4. Step 4: Simplify right side
    1,408.68x = 1,576,979.23
  5. Step 5: Solve for x
    x = 1,576,979.23/1,408.68
  6. Step 6: Final answer
    x = 1,119.47

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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.