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Finding the Fourth Proportional to 813.20, 1,122.21 and 440.18

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Solution

The fourth proportional to 813.20, 1,122.21 and 440.18 is: 607.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.20 : 1,122.21 = 440.18 : x
  2. Step 2: Convert to fraction form
    813.20/1,122.21 = 440.18/x
  3. Step 3: Cross multiply
    813.20x = 1,122.21 × 440.18
  4. Step 4: Simplify right side
    813.20x = 493,968.79
  5. Step 5: Solve for x
    x = 493,968.79/813.20
  6. Step 6: Final answer
    x = 607.44

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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.