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Finding the Fourth Proportional to 939.79, 1,409.55 and 290.44

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Solution

The fourth proportional to 939.79, 1,409.55 and 290.44 is: 435.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.79 : 1,409.55 = 290.44 : x
  2. Step 2: Convert to fraction form
    939.79/1,409.55 = 290.44/x
  3. Step 3: Cross multiply
    939.79x = 1,409.55 × 290.44
  4. Step 4: Simplify right side
    939.79x = 409,389.70
  5. Step 5: Solve for x
    x = 409,389.70/939.79
  6. Step 6: Final answer
    x = 435.62

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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.