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Finding the Fourth Proportional to 515.62, 711.20 and 319.02

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Solution

The fourth proportional to 515.62, 711.20 and 319.02 is: 440.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.62 : 711.20 = 319.02 : x
  2. Step 2: Convert to fraction form
    515.62/711.20 = 319.02/x
  3. Step 3: Cross multiply
    515.62x = 711.20 × 319.02
  4. Step 4: Simplify right side
    515.62x = 226,882.67
  5. Step 5: Solve for x
    x = 226,882.67/515.62
  6. Step 6: Final answer
    x = 440.02

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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.