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Finding the Fourth Proportional to 815.28, 1,124.64 and 520.44

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Solution

The fourth proportional to 815.28, 1,124.64 and 520.44 is: 717.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.28 : 1,124.64 = 520.44 : x
  2. Step 2: Convert to fraction form
    815.28/1,124.64 = 520.44/x
  3. Step 3: Cross multiply
    815.28x = 1,124.64 × 520.44
  4. Step 4: Simplify right side
    815.28x = 585,307.64
  5. Step 5: Solve for x
    x = 585,307.64/815.28
  6. Step 6: Final answer
    x = 717.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.