Home / 1,688.68-2,530.50-1,321.84

Finding the Fourth Proportional to 1,688.68, 2,530.50 and 1,321.84

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Solution

The fourth proportional to 1,688.68, 2,530.50 and 1,321.84 is: 1,980.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.68 : 2,530.50 = 1,321.84 : x
  2. Step 2: Convert to fraction form
    1,688.68/2,530.50 = 1,321.84/x
  3. Step 3: Cross multiply
    1,688.68x = 2,530.50 × 1,321.84
  4. Step 4: Simplify right side
    1,688.68x = 3,344,916.12
  5. Step 5: Solve for x
    x = 3,344,916.12/1,688.68
  6. Step 6: Final answer
    x = 1,980.79

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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.