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Finding the Fourth Proportional to 913.62, 1,363.30 and 815.46

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Solution

The fourth proportional to 913.62, 1,363.30 and 815.46 is: 1,216.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.62 : 1,363.30 = 815.46 : x
  2. Step 2: Convert to fraction form
    913.62/1,363.30 = 815.46/x
  3. Step 3: Cross multiply
    913.62x = 1,363.30 × 815.46
  4. Step 4: Simplify right side
    913.62x = 1,111,716.62
  5. Step 5: Solve for x
    x = 1,111,716.62/913.62
  6. Step 6: Final answer
    x = 1,216.83

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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.