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Finding the Fourth Proportional to 215,831.80, 323,747.70 and 66,071.80

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Solution

The fourth proportional to 215,831.80, 323,747.70 and 66,071.80 is: 99,107.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,831.80 : 323,747.70 = 66,071.80 : x
  2. Step 2: Convert to fraction form
    215,831.80/323,747.70 = 66,071.80/x
  3. Step 3: Cross multiply
    215,831.80x = 323,747.70 × 66,071.80
  4. Step 4: Simplify right side
    215,831.80x = 21,390,593,284.86
  5. Step 5: Solve for x
    x = 21,390,593,284.86/215,831.80
  6. Step 6: Final answer
    x = 99,107.70

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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.