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Finding the Fourth Proportional to 813.34, 1,220.38 and 448.12

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Solution

The fourth proportional to 813.34, 1,220.38 and 448.12 is: 672.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.34 : 1,220.38 = 448.12 : x
  2. Step 2: Convert to fraction form
    813.34/1,220.38 = 448.12/x
  3. Step 3: Cross multiply
    813.34x = 1,220.38 × 448.12
  4. Step 4: Simplify right side
    813.34x = 546,876.69
  5. Step 5: Solve for x
    x = 546,876.69/813.34
  6. Step 6: Final answer
    x = 672.38

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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.