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Finding the Fourth Proportional to 626.40, 864.08 and 393.12

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Solution

The fourth proportional to 626.40, 864.08 and 393.12 is: 542.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.40 : 864.08 = 393.12 : x
  2. Step 2: Convert to fraction form
    626.40/864.08 = 393.12/x
  3. Step 3: Cross multiply
    626.40x = 864.08 × 393.12
  4. Step 4: Simplify right side
    626.40x = 339,687.13
  5. Step 5: Solve for x
    x = 339,687.13/626.40
  6. Step 6: Final answer
    x = 542.28

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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.