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Finding the Fourth Proportional to 1,107.99, 1,660.14 and 782.76

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Solution

The fourth proportional to 1,107.99, 1,660.14 and 782.76 is: 1,172.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.99 : 1,660.14 = 782.76 : x
  2. Step 2: Convert to fraction form
    1,107.99/1,660.14 = 782.76/x
  3. Step 3: Cross multiply
    1,107.99x = 1,660.14 × 782.76
  4. Step 4: Simplify right side
    1,107.99x = 1,299,491.19
  5. Step 5: Solve for x
    x = 1,299,491.19/1,107.99
  6. Step 6: Final answer
    x = 1,172.84

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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.