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Finding the Fourth Proportional to 939.52, 1,409.28 and 290.28

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Solution

The fourth proportional to 939.52, 1,409.28 and 290.28 is: 435.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.52 : 1,409.28 = 290.28 : x
  2. Step 2: Convert to fraction form
    939.52/1,409.28 = 290.28/x
  3. Step 3: Cross multiply
    939.52x = 1,409.28 × 290.28
  4. Step 4: Simplify right side
    939.52x = 409,085.80
  5. Step 5: Solve for x
    x = 409,085.80/939.52
  6. Step 6: Final answer
    x = 435.42

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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.