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Finding the Fourth Proportional to 649.28, 896 and 354.55

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Solution

The fourth proportional to 649.28, 896 and 354.55 is: 489.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.28 : 896 = 354.55 : x
  2. Step 2: Convert to fraction form
    649.28/896 = 354.55/x
  3. Step 3: Cross multiply
    649.28x = 896 × 354.55
  4. Step 4: Simplify right side
    649.28x = 317,672.32
  5. Step 5: Solve for x
    x = 317,672.32/649.28
  6. Step 6: Final answer
    x = 489.27

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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.