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Finding the Fourth Proportional to 699.49, 1,048.63 and 391.42

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Solution

The fourth proportional to 699.49, 1,048.63 and 391.42 is: 586.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.49 : 1,048.63 = 391.42 : x
  2. Step 2: Convert to fraction form
    699.49/1,048.63 = 391.42/x
  3. Step 3: Cross multiply
    699.49x = 1,048.63 × 391.42
  4. Step 4: Simplify right side
    699.49x = 410,454.75
  5. Step 5: Solve for x
    x = 410,454.75/699.49
  6. Step 6: Final answer
    x = 586.79

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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.