Home / 1,216.18-1,689.91-1,200.70

Finding the Fourth Proportional to 1,216.18, 1,689.91 and 1,200.70

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Solution

The fourth proportional to 1,216.18, 1,689.91 and 1,200.70 is: 1,668.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.18 : 1,689.91 = 1,200.70 : x
  2. Step 2: Convert to fraction form
    1,216.18/1,689.91 = 1,200.70/x
  3. Step 3: Cross multiply
    1,216.18x = 1,689.91 × 1,200.70
  4. Step 4: Simplify right side
    1,216.18x = 2,029,074.94
  5. Step 5: Solve for x
    x = 2,029,074.94/1,216.18
  6. Step 6: Final answer
    x = 1,668.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.