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Finding the Fourth Proportional to 699.48, 1,047.92 and 391.48

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Solution

The fourth proportional to 699.48, 1,047.92 and 391.48 is: 586.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.48 : 1,047.92 = 391.48 : x
  2. Step 2: Convert to fraction form
    699.48/1,047.92 = 391.48/x
  3. Step 3: Cross multiply
    699.48x = 1,047.92 × 391.48
  4. Step 4: Simplify right side
    699.48x = 410,239.72
  5. Step 5: Solve for x
    x = 410,239.72/699.48
  6. Step 6: Final answer
    x = 586.49

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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.