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Finding the Fourth Proportional to 815.82, 1,223.73 and 424.86

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Solution

The fourth proportional to 815.82, 1,223.73 and 424.86 is: 637.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.82 : 1,223.73 = 424.86 : x
  2. Step 2: Convert to fraction form
    815.82/1,223.73 = 424.86/x
  3. Step 3: Cross multiply
    815.82x = 1,223.73 × 424.86
  4. Step 4: Simplify right side
    815.82x = 519,913.93
  5. Step 5: Solve for x
    x = 519,913.93/815.82
  6. Step 6: Final answer
    x = 637.29

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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.