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Finding the Fourth Proportional to 925.62, 1,389.09 and 515.09

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Solution

The fourth proportional to 925.62, 1,389.09 and 515.09 is: 772.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.62 : 1,389.09 = 515.09 : x
  2. Step 2: Convert to fraction form
    925.62/1,389.09 = 515.09/x
  3. Step 3: Cross multiply
    925.62x = 1,389.09 × 515.09
  4. Step 4: Simplify right side
    925.62x = 715,499.42
  5. Step 5: Solve for x
    x = 715,499.42/925.62
  6. Step 6: Final answer
    x = 772.99

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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.