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Finding the Fourth Proportional to 959.81, 1,439.72 and 343.40

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Solution

The fourth proportional to 959.81, 1,439.72 and 343.40 is: 515.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.81 : 1,439.72 = 343.40 : x
  2. Step 2: Convert to fraction form
    959.81/1,439.72 = 343.40/x
  3. Step 3: Cross multiply
    959.81x = 1,439.72 × 343.40
  4. Step 4: Simplify right side
    959.81x = 494,398.13
  5. Step 5: Solve for x
    x = 494,398.13/959.81
  6. Step 6: Final answer
    x = 515.10

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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.