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Finding the Fourth Proportional to 815.12, 1,124.57 and 535.50

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Solution

The fourth proportional to 815.12, 1,124.57 and 535.50 is: 738.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.12 : 1,124.57 = 535.50 : x
  2. Step 2: Convert to fraction form
    815.12/1,124.57 = 535.50/x
  3. Step 3: Cross multiply
    815.12x = 1,124.57 × 535.50
  4. Step 4: Simplify right side
    815.12x = 602,204.56
  5. Step 5: Solve for x
    x = 602,204.56/815.12
  6. Step 6: Final answer
    x = 738.80

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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.