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Finding the Fourth Proportional to 939.88, 1,409.79 and 392.05

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Solution

The fourth proportional to 939.88, 1,409.79 and 392.05 is: 588.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.88 : 1,409.79 = 392.05 : x
  2. Step 2: Convert to fraction form
    939.88/1,409.79 = 392.05/x
  3. Step 3: Cross multiply
    939.88x = 1,409.79 × 392.05
  4. Step 4: Simplify right side
    939.88x = 552,701.12
  5. Step 5: Solve for x
    x = 552,701.12/939.88
  6. Step 6: Final answer
    x = 588.06

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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.