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Finding the Fourth Proportional to 815.52, 1,223.28 and 328.64

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Solution

The fourth proportional to 815.52, 1,223.28 and 328.64 is: 492.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.52 : 1,223.28 = 328.64 : x
  2. Step 2: Convert to fraction form
    815.52/1,223.28 = 328.64/x
  3. Step 3: Cross multiply
    815.52x = 1,223.28 × 328.64
  4. Step 4: Simplify right side
    815.52x = 402,018.74
  5. Step 5: Solve for x
    x = 402,018.74/815.52
  6. Step 6: Final answer
    x = 492.96

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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.