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Finding the Fourth Proportional to 926.91, 1,389.56 and 440.30

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Solution

The fourth proportional to 926.91, 1,389.56 and 440.30 is: 660.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.91 : 1,389.56 = 440.30 : x
  2. Step 2: Convert to fraction form
    926.91/1,389.56 = 440.30/x
  3. Step 3: Cross multiply
    926.91x = 1,389.56 × 440.30
  4. Step 4: Simplify right side
    926.91x = 611,824.54
  5. Step 5: Solve for x
    x = 611,824.54/926.91
  6. Step 6: Final answer
    x = 660.07

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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.