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Finding the Fourth Proportional to 1,013.85, 1,398.15 and 698.61

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Solution

The fourth proportional to 1,013.85, 1,398.15 and 698.61 is: 963.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.85 : 1,398.15 = 698.61 : x
  2. Step 2: Convert to fraction form
    1,013.85/1,398.15 = 698.61/x
  3. Step 3: Cross multiply
    1,013.85x = 1,398.15 × 698.61
  4. Step 4: Simplify right side
    1,013.85x = 976,761.57
  5. Step 5: Solve for x
    x = 976,761.57/1,013.85
  6. Step 6: Final answer
    x = 963.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.