Home / 1,689.08-2,331.18-1,218.54

Finding the Fourth Proportional to 1,689.08, 2,331.18 and 1,218.54

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Solution

The fourth proportional to 1,689.08, 2,331.18 and 1,218.54 is: 1,681.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.08 : 2,331.18 = 1,218.54 : x
  2. Step 2: Convert to fraction form
    1,689.08/2,331.18 = 1,218.54/x
  3. Step 3: Cross multiply
    1,689.08x = 2,331.18 × 1,218.54
  4. Step 4: Simplify right side
    1,689.08x = 2,840,618.33
  5. Step 5: Solve for x
    x = 2,840,618.33/1,689.08
  6. Step 6: Final answer
    x = 1,681.75

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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.