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Finding the Fourth Proportional to 913.45, 1,370.31 and 336.28

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Solution

The fourth proportional to 913.45, 1,370.31 and 336.28 is: 504.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.45 : 1,370.31 = 336.28 : x
  2. Step 2: Convert to fraction form
    913.45/1,370.31 = 336.28/x
  3. Step 3: Cross multiply
    913.45x = 1,370.31 × 336.28
  4. Step 4: Simplify right side
    913.45x = 460,807.85
  5. Step 5: Solve for x
    x = 460,807.85/913.45
  6. Step 6: Final answer
    x = 504.47

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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.