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Finding the Fourth Proportional to 788.82, 1,087.32 and 622.76

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Solution

The fourth proportional to 788.82, 1,087.32 and 622.76 is: 858.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.82 : 1,087.32 = 622.76 : x
  2. Step 2: Convert to fraction form
    788.82/1,087.32 = 622.76/x
  3. Step 3: Cross multiply
    788.82x = 1,087.32 × 622.76
  4. Step 4: Simplify right side
    788.82x = 677,139.40
  5. Step 5: Solve for x
    x = 677,139.40/788.82
  6. Step 6: Final answer
    x = 858.42

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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.