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Finding the Fourth Proportional to 626.70, 939.57 and 318.40

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Solution

The fourth proportional to 626.70, 939.57 and 318.40 is: 477.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.70 : 939.57 = 318.40 : x
  2. Step 2: Convert to fraction form
    626.70/939.57 = 318.40/x
  3. Step 3: Cross multiply
    626.70x = 939.57 × 318.40
  4. Step 4: Simplify right side
    626.70x = 299,159.09
  5. Step 5: Solve for x
    x = 299,159.09/626.70
  6. Step 6: Final answer
    x = 477.36

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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.