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Finding the Fourth Proportional to 626.70, 864.72 and 393.69

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Solution

The fourth proportional to 626.70, 864.72 and 393.69 is: 543.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.70 : 864.72 = 393.69 : x
  2. Step 2: Convert to fraction form
    626.70/864.72 = 393.69/x
  3. Step 3: Cross multiply
    626.70x = 864.72 × 393.69
  4. Step 4: Simplify right side
    626.70x = 340,429.46
  5. Step 5: Solve for x
    x = 340,429.46/626.70
  6. Step 6: Final answer
    x = 543.21

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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.