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Finding the Fourth Proportional to 687.18, 1,030.79 and 248.47

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Solution

The fourth proportional to 687.18, 1,030.79 and 248.47 is: 372.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.18 : 1,030.79 = 248.47 : x
  2. Step 2: Convert to fraction form
    687.18/1,030.79 = 248.47/x
  3. Step 3: Cross multiply
    687.18x = 1,030.79 × 248.47
  4. Step 4: Simplify right side
    687.18x = 256,120.39
  5. Step 5: Solve for x
    x = 256,120.39/687.18
  6. Step 6: Final answer
    x = 372.71

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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.