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Finding the Fourth Proportional to 1,000.76, 1,498.74 and 779.78

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Solution

The fourth proportional to 1,000.76, 1,498.74 and 779.78 is: 1,167.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.76 : 1,498.74 = 779.78 : x
  2. Step 2: Convert to fraction form
    1,000.76/1,498.74 = 779.78/x
  3. Step 3: Cross multiply
    1,000.76x = 1,498.74 × 779.78
  4. Step 4: Simplify right side
    1,000.76x = 1,168,683.16
  5. Step 5: Solve for x
    x = 1,168,683.16/1,000.76
  6. Step 6: Final answer
    x = 1,167.80

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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.