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Finding the Fourth Proportional to 628.20, 938.61 and 628.20

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Solution

The fourth proportional to 628.20, 938.61 and 628.20 is: 938.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.20 : 938.61 = 628.20 : x
  2. Step 2: Convert to fraction form
    628.20/938.61 = 628.20/x
  3. Step 3: Cross multiply
    628.20x = 938.61 × 628.20
  4. Step 4: Simplify right side
    628.20x = 589,634.80
  5. Step 5: Solve for x
    x = 589,634.80/628.20
  6. Step 6: Final answer
    x = 938.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.