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Finding the Fourth Proportional to 515.33, 711.20 and 426.79

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Solution

The fourth proportional to 515.33, 711.20 and 426.79 is: 589.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.33 : 711.20 = 426.79 : x
  2. Step 2: Convert to fraction form
    515.33/711.20 = 426.79/x
  3. Step 3: Cross multiply
    515.33x = 711.20 × 426.79
  4. Step 4: Simplify right side
    515.33x = 303,533.05
  5. Step 5: Solve for x
    x = 303,533.05/515.33
  6. Step 6: Final answer
    x = 589.01

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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.