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Finding the Fourth Proportional to 815.15, 1,223.32 and 554.53

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Solution

The fourth proportional to 815.15, 1,223.32 and 554.53 is: 832.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.15 : 1,223.32 = 554.53 : x
  2. Step 2: Convert to fraction form
    815.15/1,223.32 = 554.53/x
  3. Step 3: Cross multiply
    815.15x = 1,223.32 × 554.53
  4. Step 4: Simplify right side
    815.15x = 678,367.64
  5. Step 5: Solve for x
    x = 678,367.64/815.15
  6. Step 6: Final answer
    x = 832.20

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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.