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Finding the Fourth Proportional to 649.68, 974.04 and 393.12

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Solution

The fourth proportional to 649.68, 974.04 and 393.12 is: 589.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.68 : 974.04 = 393.12 : x
  2. Step 2: Convert to fraction form
    649.68/974.04 = 393.12/x
  3. Step 3: Cross multiply
    649.68x = 974.04 × 393.12
  4. Step 4: Simplify right side
    649.68x = 382,914.60
  5. Step 5: Solve for x
    x = 382,914.60/649.68
  6. Step 6: Final answer
    x = 589.39

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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.