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Finding the Fourth Proportional to 815.31, 1,125.09 and 500.49

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Solution

The fourth proportional to 815.31, 1,125.09 and 500.49 is: 690.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.31 : 1,125.09 = 500.49 : x
  2. Step 2: Convert to fraction form
    815.31/1,125.09 = 500.49/x
  3. Step 3: Cross multiply
    815.31x = 1,125.09 × 500.49
  4. Step 4: Simplify right side
    815.31x = 563,096.29
  5. Step 5: Solve for x
    x = 563,096.29/815.31
  6. Step 6: Final answer
    x = 690.65

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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.