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Finding the Fourth Proportional to 808.62, 1,116.42 and 631.77

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Solution

The fourth proportional to 808.62, 1,116.42 and 631.77 is: 872.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.62 : 1,116.42 = 631.77 : x
  2. Step 2: Convert to fraction form
    808.62/1,116.42 = 631.77/x
  3. Step 3: Cross multiply
    808.62x = 1,116.42 × 631.77
  4. Step 4: Simplify right side
    808.62x = 705,320.66
  5. Step 5: Solve for x
    x = 705,320.66/808.62
  6. Step 6: Final answer
    x = 872.25

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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.