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Finding the Fourth Proportional to 815.12, 1,124.78 and 500.43

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Solution

The fourth proportional to 815.12, 1,124.78 and 500.43 is: 690.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.12 : 1,124.78 = 500.43 : x
  2. Step 2: Convert to fraction form
    815.12/1,124.78 = 500.43/x
  3. Step 3: Cross multiply
    815.12x = 1,124.78 × 500.43
  4. Step 4: Simplify right side
    815.12x = 562,873.66
  5. Step 5: Solve for x
    x = 562,873.66/815.12
  6. Step 6: Final answer
    x = 690.54

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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.