Home / 1,688.28-2,530.68-821.52

Finding the Fourth Proportional to 1,688.28, 2,530.68 and 821.52

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Solution

The fourth proportional to 1,688.28, 2,530.68 and 821.52 is: 1,231.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.28 : 2,530.68 = 821.52 : x
  2. Step 2: Convert to fraction form
    1,688.28/2,530.68 = 821.52/x
  3. Step 3: Cross multiply
    1,688.28x = 2,530.68 × 821.52
  4. Step 4: Simplify right side
    1,688.28x = 2,079,004.23
  5. Step 5: Solve for x
    x = 2,079,004.23/1,688.28
  6. Step 6: Final answer
    x = 1,231.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.