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Finding the Fourth Proportional to 926.37, 1,390.46 and 439.75

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Solution

The fourth proportional to 926.37, 1,390.46 and 439.75 is: 660.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.37 : 1,390.46 = 439.75 : x
  2. Step 2: Convert to fraction form
    926.37/1,390.46 = 439.75/x
  3. Step 3: Cross multiply
    926.37x = 1,390.46 × 439.75
  4. Step 4: Simplify right side
    926.37x = 611,454.79
  5. Step 5: Solve for x
    x = 611,454.79/926.37
  6. Step 6: Final answer
    x = 660.05

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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.