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Finding the Fourth Proportional to 698.56, 1,048.86 and 391.01

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Solution

The fourth proportional to 698.56, 1,048.86 and 391.01 is: 587.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.56 : 1,048.86 = 391.01 : x
  2. Step 2: Convert to fraction form
    698.56/1,048.86 = 391.01/x
  3. Step 3: Cross multiply
    698.56x = 1,048.86 × 391.01
  4. Step 4: Simplify right side
    698.56x = 410,114.75
  5. Step 5: Solve for x
    x = 410,114.75/698.56
  6. Step 6: Final answer
    x = 587.09

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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.