Home / 1,680.28-2,318.74-981.64

Finding the Fourth Proportional to 1,680.28, 2,318.74 and 981.64

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Solution

The fourth proportional to 1,680.28, 2,318.74 and 981.64 is: 1,354.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.28 : 2,318.74 = 981.64 : x
  2. Step 2: Convert to fraction form
    1,680.28/2,318.74 = 981.64/x
  3. Step 3: Cross multiply
    1,680.28x = 2,318.74 × 981.64
  4. Step 4: Simplify right side
    1,680.28x = 2,276,167.93
  5. Step 5: Solve for x
    x = 2,276,167.93/1,680.28
  6. Step 6: Final answer
    x = 1,354.64

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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.