Home / 1,455.15-2,181.63-684.75

Finding the Fourth Proportional to 1,455.15, 2,181.63 and 684.75

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Solution

The fourth proportional to 1,455.15, 2,181.63 and 684.75 is: 1,026.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.15 : 2,181.63 = 684.75 : x
  2. Step 2: Convert to fraction form
    1,455.15/2,181.63 = 684.75/x
  3. Step 3: Cross multiply
    1,455.15x = 2,181.63 × 684.75
  4. Step 4: Simplify right side
    1,455.15x = 1,493,871.14
  5. Step 5: Solve for x
    x = 1,493,871.14/1,455.15
  6. Step 6: Final answer
    x = 1,026.61

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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.