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Finding the Fourth Proportional to 959.70, 1,439.55 and 838.20

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Solution

The fourth proportional to 959.70, 1,439.55 and 838.20 is: 1,257.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.70 : 1,439.55 = 838.20 : x
  2. Step 2: Convert to fraction form
    959.70/1,439.55 = 838.20/x
  3. Step 3: Cross multiply
    959.70x = 1,439.55 × 838.20
  4. Step 4: Simplify right side
    959.70x = 1,206,630.81
  5. Step 5: Solve for x
    x = 1,206,630.81/959.70
  6. Step 6: Final answer
    x = 1,257.30

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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.