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Finding the Fourth Proportional to 1,002.76, 1,503.78 and 786.76

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Solution

The fourth proportional to 1,002.76, 1,503.78 and 786.76 is: 1,179.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.76 : 1,503.78 = 786.76 : x
  2. Step 2: Convert to fraction form
    1,002.76/1,503.78 = 786.76/x
  3. Step 3: Cross multiply
    1,002.76x = 1,503.78 × 786.76
  4. Step 4: Simplify right side
    1,002.76x = 1,183,113.95
  5. Step 5: Solve for x
    x = 1,183,113.95/1,002.76
  6. Step 6: Final answer
    x = 1,179.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.