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Finding the Fourth Proportional to 1,121.99, 1,683.84 and 777.74

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Solution

The fourth proportional to 1,121.99, 1,683.84 and 777.74 is: 1,167.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.99 : 1,683.84 = 777.74 : x
  2. Step 2: Convert to fraction form
    1,121.99/1,683.84 = 777.74/x
  3. Step 3: Cross multiply
    1,121.99x = 1,683.84 × 777.74
  4. Step 4: Simplify right side
    1,121.99x = 1,309,581.30
  5. Step 5: Solve for x
    x = 1,309,581.30/1,121.99
  6. Step 6: Final answer
    x = 1,167.20

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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.