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Finding the Fourth Proportional to 940.32, 1,399.41 and 909.18

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Solution

The fourth proportional to 940.32, 1,399.41 and 909.18 is: 1,353.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.32 : 1,399.41 = 909.18 : x
  2. Step 2: Convert to fraction form
    940.32/1,399.41 = 909.18/x
  3. Step 3: Cross multiply
    940.32x = 1,399.41 × 909.18
  4. Step 4: Simplify right side
    940.32x = 1,272,306.31
  5. Step 5: Solve for x
    x = 1,272,306.31/940.32
  6. Step 6: Final answer
    x = 1,353.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.