Home / 89,987.69-135,120.26-76,129.81

Finding the Fourth Proportional to 89,987.69, 135,120.26 and 76,129.81

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Solution

The fourth proportional to 89,987.69, 135,120.26 and 76,129.81 is: 114,312.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,987.69 : 135,120.26 = 76,129.81 : x
  2. Step 2: Convert to fraction form
    89,987.69/135,120.26 = 76,129.81/x
  3. Step 3: Cross multiply
    89,987.69x = 135,120.26 × 76,129.81
  4. Step 4: Simplify right side
    89,987.69x = 10,286,679,573.47
  5. Step 5: Solve for x
    x = 10,286,679,573.47/89,987.69
  6. Step 6: Final answer
    x = 114,312.07

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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.