Home / 2,166.62-2,987.89-1,421.21

Finding the Fourth Proportional to 2,166.62, 2,987.89 and 1,421.21

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Solution

The fourth proportional to 2,166.62, 2,987.89 and 1,421.21 is: 1,959.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,166.62 : 2,987.89 = 1,421.21 : x
  2. Step 2: Convert to fraction form
    2,166.62/2,987.89 = 1,421.21/x
  3. Step 3: Cross multiply
    2,166.62x = 2,987.89 × 1,421.21
  4. Step 4: Simplify right side
    2,166.62x = 4,246,423.06
  5. Step 5: Solve for x
    x = 4,246,423.06/2,166.62
  6. Step 6: Final answer
    x = 1,959.93

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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.