Home / 1,680.56-2,318.64-981.68

Finding the Fourth Proportional to 1,680.56, 2,318.64 and 981.68

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Solution

The fourth proportional to 1,680.56, 2,318.64 and 981.68 is: 1,354.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.56 : 2,318.64 = 981.68 : x
  2. Step 2: Convert to fraction form
    1,680.56/2,318.64 = 981.68/x
  3. Step 3: Cross multiply
    1,680.56x = 2,318.64 × 981.68
  4. Step 4: Simplify right side
    1,680.56x = 2,276,162.52
  5. Step 5: Solve for x
    x = 2,276,162.52/1,680.56
  6. Step 6: Final answer
    x = 1,354.41

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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.