Home / 1,680.32-2,318.10-981.38

Finding the Fourth Proportional to 1,680.32, 2,318.10 and 981.38

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Solution

The fourth proportional to 1,680.32, 2,318.10 and 981.38 is: 1,353.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.32 : 2,318.10 = 981.38 : x
  2. Step 2: Convert to fraction form
    1,680.32/2,318.10 = 981.38/x
  3. Step 3: Cross multiply
    1,680.32x = 2,318.10 × 981.38
  4. Step 4: Simplify right side
    1,680.32x = 2,274,936.98
  5. Step 5: Solve for x
    x = 2,274,936.98/1,680.32
  6. Step 6: Final answer
    x = 1,353.87

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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.