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Finding the Fourth Proportional to 67,881.40, 101,831.70 and 21,129.40

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Solution

The fourth proportional to 67,881.40, 101,831.70 and 21,129.40 is: 31,697.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,881.40 : 101,831.70 = 21,129.40 : x
  2. Step 2: Convert to fraction form
    67,881.40/101,831.70 = 21,129.40/x
  3. Step 3: Cross multiply
    67,881.40x = 101,831.70 × 21,129.40
  4. Step 4: Simplify right side
    67,881.40x = 2,151,642,721.98
  5. Step 5: Solve for x
    x = 2,151,642,721.98/67,881.40
  6. Step 6: Final answer
    x = 31,697.09

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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.