Home / 1,688.28-2,330.03-989.66

Finding the Fourth Proportional to 1,688.28, 2,330.03 and 989.66

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Solution

The fourth proportional to 1,688.28, 2,330.03 and 989.66 is: 1,365.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.28 : 2,330.03 = 989.66 : x
  2. Step 2: Convert to fraction form
    1,688.28/2,330.03 = 989.66/x
  3. Step 3: Cross multiply
    1,688.28x = 2,330.03 × 989.66
  4. Step 4: Simplify right side
    1,688.28x = 2,305,937.49
  5. Step 5: Solve for x
    x = 2,305,937.49/1,688.28
  6. Step 6: Final answer
    x = 1,365.85

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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.