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Finding the Fourth Proportional to 940.26, 1,409.18 and 391.70

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Solution

The fourth proportional to 940.26, 1,409.18 and 391.70 is: 587.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.26 : 1,409.18 = 391.70 : x
  2. Step 2: Convert to fraction form
    940.26/1,409.18 = 391.70/x
  3. Step 3: Cross multiply
    940.26x = 1,409.18 × 391.70
  4. Step 4: Simplify right side
    940.26x = 551,966.80
  5. Step 5: Solve for x
    x = 551,966.80/940.26
  6. Step 6: Final answer
    x = 587.04

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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.