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Finding the Fourth Proportional to 698.70, 1,048.05 and 265.80

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Solution

The fourth proportional to 698.70, 1,048.05 and 265.80 is: 398.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.70 : 1,048.05 = 265.80 : x
  2. Step 2: Convert to fraction form
    698.70/1,048.05 = 265.80/x
  3. Step 3: Cross multiply
    698.70x = 1,048.05 × 265.80
  4. Step 4: Simplify right side
    698.70x = 278,571.69
  5. Step 5: Solve for x
    x = 278,571.69/698.70
  6. Step 6: Final answer
    x = 398.70

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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.