Home / 2,165.79-2,988.81-1,221.54

Finding the Fourth Proportional to 2,165.79, 2,988.81 and 1,221.54

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Solution

The fourth proportional to 2,165.79, 2,988.81 and 1,221.54 is: 1,685.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,165.79 : 2,988.81 = 1,221.54 : x
  2. Step 2: Convert to fraction form
    2,165.79/2,988.81 = 1,221.54/x
  3. Step 3: Cross multiply
    2,165.79x = 2,988.81 × 1,221.54
  4. Step 4: Simplify right side
    2,165.79x = 3,650,950.97
  5. Step 5: Solve for x
    x = 3,650,950.97/2,165.79
  6. Step 6: Final answer
    x = 1,685.74

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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.