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Finding the Fourth Proportional to 813.45, 1,122.56 and 440.42

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Solution

The fourth proportional to 813.45, 1,122.56 and 440.42 is: 607.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.45 : 1,122.56 = 440.42 : x
  2. Step 2: Convert to fraction form
    813.45/1,122.56 = 440.42/x
  3. Step 3: Cross multiply
    813.45x = 1,122.56 × 440.42
  4. Step 4: Simplify right side
    813.45x = 494,402.76
  5. Step 5: Solve for x
    x = 494,402.76/813.45
  6. Step 6: Final answer
    x = 607.78

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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.