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Finding the Fourth Proportional to 2,169.80, 3,254.70 and 784.11

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Solution

The fourth proportional to 2,169.80, 3,254.70 and 784.11 is: 1,176.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,169.80 : 3,254.70 = 784.11 : x
  2. Step 2: Convert to fraction form
    2,169.80/3,254.70 = 784.11/x
  3. Step 3: Cross multiply
    2,169.80x = 3,254.70 × 784.11
  4. Step 4: Simplify right side
    2,169.80x = 2,552,062.36
  5. Step 5: Solve for x
    x = 2,552,062.36/2,169.80
  6. Step 6: Final answer
    x = 1,176.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.