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Finding the Fourth Proportional to 925.83, 1,390.11 and 439.23

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Solution

The fourth proportional to 925.83, 1,390.11 and 439.23 is: 659.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.83 : 1,390.11 = 439.23 : x
  2. Step 2: Convert to fraction form
    925.83/1,390.11 = 439.23/x
  3. Step 3: Cross multiply
    925.83x = 1,390.11 × 439.23
  4. Step 4: Simplify right side
    925.83x = 610,578.02
  5. Step 5: Solve for x
    x = 610,578.02/925.83
  6. Step 6: Final answer
    x = 659.49

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1.5x scale

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.