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Finding the Fourth Proportional to 926.41, 1,390.29 and 439.46

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Solution

The fourth proportional to 926.41, 1,390.29 and 439.46 is: 659.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.41 : 1,390.29 = 439.46 : x
  2. Step 2: Convert to fraction form
    926.41/1,390.29 = 439.46/x
  3. Step 3: Cross multiply
    926.41x = 1,390.29 × 439.46
  4. Step 4: Simplify right side
    926.41x = 610,976.84
  5. Step 5: Solve for x
    x = 610,976.84/926.41
  6. Step 6: Final answer
    x = 659.51

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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.