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Finding the Fourth Proportional to 886.91, 1,329.96 and 338.70

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Solution

The fourth proportional to 886.91, 1,329.96 and 338.70 is: 507.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.91 : 1,329.96 = 338.70 : x
  2. Step 2: Convert to fraction form
    886.91/1,329.96 = 338.70/x
  3. Step 3: Cross multiply
    886.91x = 1,329.96 × 338.70
  4. Step 4: Simplify right side
    886.91x = 450,457.45
  5. Step 5: Solve for x
    x = 450,457.45/886.91
  6. Step 6: Final answer
    x = 507.90

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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.