Home / 5,128.48-7,689.84-2,125.60

Finding the Fourth Proportional to 5,128.48, 7,689.84 and 2,125.60

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Solution

The fourth proportional to 5,128.48, 7,689.84 and 2,125.60 is: 3,187.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.48 : 7,689.84 = 2,125.60 : x
  2. Step 2: Convert to fraction form
    5,128.48/7,689.84 = 2,125.60/x
  3. Step 3: Cross multiply
    5,128.48x = 7,689.84 × 2,125.60
  4. Step 4: Simplify right side
    5,128.48x = 16,345,523.90
  5. Step 5: Solve for x
    x = 16,345,523.90/5,128.48
  6. Step 6: Final answer
    x = 3,187.21

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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.