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Finding the Fourth Proportional to 830.28, 1,238.37 and 815.70

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Solution

The fourth proportional to 830.28, 1,238.37 and 815.70 is: 1,216.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.28 : 1,238.37 = 815.70 : x
  2. Step 2: Convert to fraction form
    830.28/1,238.37 = 815.70/x
  3. Step 3: Cross multiply
    830.28x = 1,238.37 × 815.70
  4. Step 4: Simplify right side
    830.28x = 1,010,138.41
  5. Step 5: Solve for x
    x = 1,010,138.41/830.28
  6. Step 6: Final answer
    x = 1,216.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.