Home / 90,081.81-134,860.21-86,670.09

Finding the Fourth Proportional to 90,081.81, 134,860.21 and 86,670.09

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Solution

The fourth proportional to 90,081.81, 134,860.21 and 86,670.09 is: 129,752.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,081.81 : 134,860.21 = 86,670.09 : x
  2. Step 2: Convert to fraction form
    90,081.81/134,860.21 = 86,670.09/x
  3. Step 3: Cross multiply
    90,081.81x = 134,860.21 × 86,670.09
  4. Step 4: Simplify right side
    90,081.81x = 11,688,346,321.44
  5. Step 5: Solve for x
    x = 11,688,346,321.44/90,081.81
  6. Step 6: Final answer
    x = 129,752.57

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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.