Home / 9,135.05-13,689.86-5,128.89

Finding the Fourth Proportional to 9,135.05, 13,689.86 and 5,128.89

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Solution

The fourth proportional to 9,135.05, 13,689.86 and 5,128.89 is: 7,686.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,135.05 : 13,689.86 = 5,128.89 : x
  2. Step 2: Convert to fraction form
    9,135.05/13,689.86 = 5,128.89/x
  3. Step 3: Cross multiply
    9,135.05x = 13,689.86 × 5,128.89
  4. Step 4: Simplify right side
    9,135.05x = 70,213,760.41
  5. Step 5: Solve for x
    x = 70,213,760.41/9,135.05
  6. Step 6: Final answer
    x = 7,686.20

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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.