Home / 1,689.46-2,331.81-981.42

Finding the Fourth Proportional to 1,689.46, 2,331.81 and 981.42

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Solution

The fourth proportional to 1,689.46, 2,331.81 and 981.42 is: 1,354.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.46 : 2,331.81 = 981.42 : x
  2. Step 2: Convert to fraction form
    1,689.46/2,331.81 = 981.42/x
  3. Step 3: Cross multiply
    1,689.46x = 2,331.81 × 981.42
  4. Step 4: Simplify right side
    1,689.46x = 2,288,478.99
  5. Step 5: Solve for x
    x = 2,288,478.99/1,689.46
  6. Step 6: Final answer
    x = 1,354.56

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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.