Home / 2,165.38-2,988.36-1,221.08

Finding the Fourth Proportional to 2,165.38, 2,988.36 and 1,221.08

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Solution

The fourth proportional to 2,165.38, 2,988.36 and 1,221.08 is: 1,685.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,165.38 : 2,988.36 = 1,221.08 : x
  2. Step 2: Convert to fraction form
    2,165.38/2,988.36 = 1,221.08/x
  3. Step 3: Cross multiply
    2,165.38x = 2,988.36 × 1,221.08
  4. Step 4: Simplify right side
    2,165.38x = 3,649,026.63
  5. Step 5: Solve for x
    x = 3,649,026.63/2,165.38
  6. Step 6: Final answer
    x = 1,685.17

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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.