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Finding the Fourth Proportional to 939.61, 1,409.54 and 290.39

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Solution

The fourth proportional to 939.61, 1,409.54 and 290.39 is: 435.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.61 : 1,409.54 = 290.39 : x
  2. Step 2: Convert to fraction form
    939.61/1,409.54 = 290.39/x
  3. Step 3: Cross multiply
    939.61x = 1,409.54 × 290.39
  4. Step 4: Simplify right side
    939.61x = 409,318.20
  5. Step 5: Solve for x
    x = 409,318.20/939.61
  6. Step 6: Final answer
    x = 435.63

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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.