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Finding the Fourth Proportional to 1,380.66, 2,069.76 and 686.94

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Solution

The fourth proportional to 1,380.66, 2,069.76 and 686.94 is: 1,029.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.66 : 2,069.76 = 686.94 : x
  2. Step 2: Convert to fraction form
    1,380.66/2,069.76 = 686.94/x
  3. Step 3: Cross multiply
    1,380.66x = 2,069.76 × 686.94
  4. Step 4: Simplify right side
    1,380.66x = 1,421,800.93
  5. Step 5: Solve for x
    x = 1,421,800.93/1,380.66
  6. Step 6: Final answer
    x = 1,029.80

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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.