Home / 1,689.26-2,331.48-981.56

Finding the Fourth Proportional to 1,689.26, 2,331.48 and 981.56

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Solution

The fourth proportional to 1,689.26, 2,331.48 and 981.56 is: 1,354.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.26 : 2,331.48 = 981.56 : x
  2. Step 2: Convert to fraction form
    1,689.26/2,331.48 = 981.56/x
  3. Step 3: Cross multiply
    1,689.26x = 2,331.48 × 981.56
  4. Step 4: Simplify right side
    1,689.26x = 2,288,487.51
  5. Step 5: Solve for x
    x = 2,288,487.51/1,689.26
  6. Step 6: Final answer
    x = 1,354.73

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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.