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Finding the Fourth Proportional to 815.19, 1,125.38 and 637.84

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Solution

The fourth proportional to 815.19, 1,125.38 and 637.84 is: 880.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.19 : 1,125.38 = 637.84 : x
  2. Step 2: Convert to fraction form
    815.19/1,125.38 = 637.84/x
  3. Step 3: Cross multiply
    815.19x = 1,125.38 × 637.84
  4. Step 4: Simplify right side
    815.19x = 717,813.97
  5. Step 5: Solve for x
    x = 717,813.97/815.19
  6. Step 6: Final answer
    x = 880.55

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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.