Home / 5,128.20-7,689.55-2,656.89

Finding the Fourth Proportional to 5,128.20, 7,689.55 and 2,656.89

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Solution

The fourth proportional to 5,128.20, 7,689.55 and 2,656.89 is: 3,983.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.20 : 7,689.55 = 2,656.89 : x
  2. Step 2: Convert to fraction form
    5,128.20/7,689.55 = 2,656.89/x
  3. Step 3: Cross multiply
    5,128.20x = 7,689.55 × 2,656.89
  4. Step 4: Simplify right side
    5,128.20x = 20,430,288.50
  5. Step 5: Solve for x
    x = 20,430,288.50/5,128.20
  6. Step 6: Final answer
    x = 3,983.91

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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.