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Finding the Fourth Proportional to 626.16, 864 and 393.12

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Solution

The fourth proportional to 626.16, 864 and 393.12 is: 542.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.16 : 864 = 393.12 : x
  2. Step 2: Convert to fraction form
    626.16/864 = 393.12/x
  3. Step 3: Cross multiply
    626.16x = 864 × 393.12
  4. Step 4: Simplify right side
    626.16x = 339,655.68
  5. Step 5: Solve for x
    x = 339,655.68/626.16
  6. Step 6: Final answer
    x = 542.44

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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.