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Finding the Fourth Proportional to 815.32, 1,223.30 and 359

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Solution

The fourth proportional to 815.32, 1,223.30 and 359 is: 538.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.32 : 1,223.30 = 359 : x
  2. Step 2: Convert to fraction form
    815.32/1,223.30 = 359/x
  3. Step 3: Cross multiply
    815.32x = 1,223.30 × 359
  4. Step 4: Simplify right side
    815.32x = 439,164.70
  5. Step 5: Solve for x
    x = 439,164.70/815.32
  6. Step 6: Final answer
    x = 538.64

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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.