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Finding the Fourth Proportional to 808.62, 1,113.68 and 698.05

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Solution

The fourth proportional to 808.62, 1,113.68 and 698.05 is: 961.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.62 : 1,113.68 = 698.05 : x
  2. Step 2: Convert to fraction form
    808.62/1,113.68 = 698.05/x
  3. Step 3: Cross multiply
    808.62x = 1,113.68 × 698.05
  4. Step 4: Simplify right side
    808.62x = 777,404.32
  5. Step 5: Solve for x
    x = 777,404.32/808.62
  6. Step 6: Final answer
    x = 961.40

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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.