Home / 1,380.08-2,069.86-686.52

Finding the Fourth Proportional to 1,380.08, 2,069.86 and 686.52

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Solution

The fourth proportional to 1,380.08, 2,069.86 and 686.52 is: 1,029.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.08 : 2,069.86 = 686.52 : x
  2. Step 2: Convert to fraction form
    1,380.08/2,069.86 = 686.52/x
  3. Step 3: Cross multiply
    1,380.08x = 2,069.86 × 686.52
  4. Step 4: Simplify right side
    1,380.08x = 1,421,000.29
  5. Step 5: Solve for x
    x = 1,421,000.29/1,380.08
  6. Step 6: Final answer
    x = 1,029.65

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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.