Home / 1,380.47-2,072.23-686.95

Finding the Fourth Proportional to 1,380.47, 2,072.23 and 686.95

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Solution

The fourth proportional to 1,380.47, 2,072.23 and 686.95 is: 1,031.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.47 : 2,072.23 = 686.95 : x
  2. Step 2: Convert to fraction form
    1,380.47/2,072.23 = 686.95/x
  3. Step 3: Cross multiply
    1,380.47x = 2,072.23 × 686.95
  4. Step 4: Simplify right side
    1,380.47x = 1,423,519.74
  5. Step 5: Solve for x
    x = 1,423,519.74/1,380.47
  6. Step 6: Final answer
    x = 1,031.19

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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.