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Finding the Fourth Proportional to 788.76, 1,087.02 and 578.76

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Solution

The fourth proportional to 788.76, 1,087.02 and 578.76 is: 797.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.76 : 1,087.02 = 578.76 : x
  2. Step 2: Convert to fraction form
    788.76/1,087.02 = 578.76/x
  3. Step 3: Cross multiply
    788.76x = 1,087.02 × 578.76
  4. Step 4: Simplify right side
    788.76x = 629,123.70
  5. Step 5: Solve for x
    x = 629,123.70/788.76
  6. Step 6: Final answer
    x = 797.61

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Double scale
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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.