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Finding the Fourth Proportional to 688.91, 950.76 and 426.88

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Solution

The fourth proportional to 688.91, 950.76 and 426.88 is: 589.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.91 : 950.76 = 426.88 : x
  2. Step 2: Convert to fraction form
    688.91/950.76 = 426.88/x
  3. Step 3: Cross multiply
    688.91x = 950.76 × 426.88
  4. Step 4: Simplify right side
    688.91x = 405,853.54
  5. Step 5: Solve for x
    x = 405,853.54/688.91
  6. Step 6: Final answer
    x = 589.12

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1.5x scale

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.