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Finding the Fourth Proportional to 925.84, 1,389.06 and 439

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Solution

The fourth proportional to 925.84, 1,389.06 and 439 is: 658.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.84 : 1,389.06 = 439 : x
  2. Step 2: Convert to fraction form
    925.84/1,389.06 = 439/x
  3. Step 3: Cross multiply
    925.84x = 1,389.06 × 439
  4. Step 4: Simplify right side
    925.84x = 609,797.34
  5. Step 5: Solve for x
    x = 609,797.34/925.84
  6. Step 6: Final answer
    x = 658.64

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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.