Home / 1,678.73-2,315.18-1,206.39

Finding the Fourth Proportional to 1,678.73, 2,315.18 and 1,206.39

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Solution

The fourth proportional to 1,678.73, 2,315.18 and 1,206.39 is: 1,663.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.73 : 2,315.18 = 1,206.39 : x
  2. Step 2: Convert to fraction form
    1,678.73/2,315.18 = 1,206.39/x
  3. Step 3: Cross multiply
    1,678.73x = 2,315.18 × 1,206.39
  4. Step 4: Simplify right side
    1,678.73x = 2,793,021.70
  5. Step 5: Solve for x
    x = 2,793,021.70/1,678.73
  6. Step 6: Final answer
    x = 1,663.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.