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Finding the Fourth Proportional to 886.90, 1,330.74 and 338.89

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Solution

The fourth proportional to 886.90, 1,330.74 and 338.89 is: 508.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.90 : 1,330.74 = 338.89 : x
  2. Step 2: Convert to fraction form
    886.90/1,330.74 = 338.89/x
  3. Step 3: Cross multiply
    886.90x = 1,330.74 × 338.89
  4. Step 4: Simplify right side
    886.90x = 450,974.48
  5. Step 5: Solve for x
    x = 450,974.48/886.90
  6. Step 6: Final answer
    x = 508.48

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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.