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Finding the Fourth Proportional to 626.20, 939.42 and 317.80

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Solution

The fourth proportional to 626.20, 939.42 and 317.80 is: 476.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.20 : 939.42 = 317.80 : x
  2. Step 2: Convert to fraction form
    626.20/939.42 = 317.80/x
  3. Step 3: Cross multiply
    626.20x = 939.42 × 317.80
  4. Step 4: Simplify right side
    626.20x = 298,547.68
  5. Step 5: Solve for x
    x = 298,547.68/626.20
  6. Step 6: Final answer
    x = 476.76

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1.5x scale

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.