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Finding the Fourth Proportional to 926.94, 1,390.41 and 440.13

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Solution

The fourth proportional to 926.94, 1,390.41 and 440.13 is: 660.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.94 : 1,390.41 = 440.13 : x
  2. Step 2: Convert to fraction form
    926.94/1,390.41 = 440.13/x
  3. Step 3: Cross multiply
    926.94x = 1,390.41 × 440.13
  4. Step 4: Simplify right side
    926.94x = 611,961.15
  5. Step 5: Solve for x
    x = 611,961.15/926.94
  6. Step 6: Final answer
    x = 660.20

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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.