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Finding the Fourth Proportional to 2,166.71, 2,990.08 and 1,222.51

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Solution

The fourth proportional to 2,166.71, 2,990.08 and 1,222.51 is: 1,687.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,166.71 : 2,990.08 = 1,222.51 : x
  2. Step 2: Convert to fraction form
    2,166.71/2,990.08 = 1,222.51/x
  3. Step 3: Cross multiply
    2,166.71x = 2,990.08 × 1,222.51
  4. Step 4: Simplify right side
    2,166.71x = 3,655,396.59
  5. Step 5: Solve for x
    x = 3,655,396.59/2,166.71
  6. Step 6: Final answer
    x = 1,687.07

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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.