Home / 1,216.14-1,678.49-1,117.72

Finding the Fourth Proportional to 1,216.14, 1,678.49 and 1,117.72

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Solution

The fourth proportional to 1,216.14, 1,678.49 and 1,117.72 is: 1,542.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.14 : 1,678.49 = 1,117.72 : x
  2. Step 2: Convert to fraction form
    1,216.14/1,678.49 = 1,117.72/x
  3. Step 3: Cross multiply
    1,216.14x = 1,678.49 × 1,117.72
  4. Step 4: Simplify right side
    1,216.14x = 1,876,081.84
  5. Step 5: Solve for x
    x = 1,876,081.84/1,216.14
  6. Step 6: Final answer
    x = 1,542.65

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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.