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Finding the Fourth Proportional to 959.80, 1,439.70 and 838.30

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Solution

The fourth proportional to 959.80, 1,439.70 and 838.30 is: 1,257.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.80 : 1,439.70 = 838.30 : x
  2. Step 2: Convert to fraction form
    959.80/1,439.70 = 838.30/x
  3. Step 3: Cross multiply
    959.80x = 1,439.70 × 838.30
  4. Step 4: Simplify right side
    959.80x = 1,206,900.51
  5. Step 5: Solve for x
    x = 1,206,900.51/959.80
  6. Step 6: Final answer
    x = 1,257.45

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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.