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Finding the Fourth Proportional to 1,689.74, 2,331.53 and 981.66

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Solution

The fourth proportional to 1,689.74, 2,331.53 and 981.66 is: 1,354.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.74 : 2,331.53 = 981.66 : x
  2. Step 2: Convert to fraction form
    1,689.74/2,331.53 = 981.66/x
  3. Step 3: Cross multiply
    1,689.74x = 2,331.53 × 981.66
  4. Step 4: Simplify right side
    1,689.74x = 2,288,769.74
  5. Step 5: Solve for x
    x = 2,288,769.74/1,689.74
  6. Step 6: Final answer
    x = 1,354.51

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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.