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Finding the Fourth Proportional to 815.37, 1,125.20 and 442.34

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Solution

The fourth proportional to 815.37, 1,125.20 and 442.34 is: 610.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.37 : 1,125.20 = 442.34 : x
  2. Step 2: Convert to fraction form
    815.37/1,125.20 = 442.34/x
  3. Step 3: Cross multiply
    815.37x = 1,125.20 × 442.34
  4. Step 4: Simplify right side
    815.37x = 497,720.67
  5. Step 5: Solve for x
    x = 497,720.67/815.37
  6. Step 6: Final answer
    x = 610.43

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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.