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Finding the Fourth Proportional to 788.97, 1,087.76 and 678.20

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Solution

The fourth proportional to 788.97, 1,087.76 and 678.20 is: 935.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.97 : 1,087.76 = 678.20 : x
  2. Step 2: Convert to fraction form
    788.97/1,087.76 = 678.20/x
  3. Step 3: Cross multiply
    788.97x = 1,087.76 × 678.20
  4. Step 4: Simplify right side
    788.97x = 737,718.83
  5. Step 5: Solve for x
    x = 737,718.83/788.97
  6. Step 6: Final answer
    x = 935.04

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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.