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Finding the Fourth Proportional to 808.25, 1,115.73 and 630.77

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Solution

The fourth proportional to 808.25, 1,115.73 and 630.77 is: 870.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.25 : 1,115.73 = 630.77 : x
  2. Step 2: Convert to fraction form
    808.25/1,115.73 = 630.77/x
  3. Step 3: Cross multiply
    808.25x = 1,115.73 × 630.77
  4. Step 4: Simplify right side
    808.25x = 703,763.43
  5. Step 5: Solve for x
    x = 703,763.43/808.25
  6. Step 6: Final answer
    x = 870.73

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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.