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Finding the Fourth Proportional to 788.80, 1,087.08 and 622.84

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Solution

The fourth proportional to 788.80, 1,087.08 and 622.84 is: 858.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.80 : 1,087.08 = 622.84 : x
  2. Step 2: Convert to fraction form
    788.80/1,087.08 = 622.84/x
  3. Step 3: Cross multiply
    788.80x = 1,087.08 × 622.84
  4. Step 4: Simplify right side
    788.80x = 677,076.91
  5. Step 5: Solve for x
    x = 677,076.91/788.80
  6. Step 6: Final answer
    x = 858.36

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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.