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Finding the Fourth Proportional to 217,087.80, 325,689.30 and 76,831.80

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Solution

The fourth proportional to 217,087.80, 325,689.30 and 76,831.80 is: 115,268.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,087.80 : 325,689.30 = 76,831.80 : x
  2. Step 2: Convert to fraction form
    217,087.80/325,689.30 = 76,831.80/x
  3. Step 3: Cross multiply
    217,087.80x = 325,689.30 × 76,831.80
  4. Step 4: Simplify right side
    217,087.80x = 25,023,295,159.74
  5. Step 5: Solve for x
    x = 25,023,295,159.74/217,087.80
  6. Step 6: Final answer
    x = 115,268.09

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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.