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Finding the Fourth Proportional to 81,249.40, 121,874.10 and 70,881.40

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Solution

The fourth proportional to 81,249.40, 121,874.10 and 70,881.40 is: 106,322.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,249.40 : 121,874.10 = 70,881.40 : x
  2. Step 2: Convert to fraction form
    81,249.40/121,874.10 = 70,881.40/x
  3. Step 3: Cross multiply
    81,249.40x = 121,874.10 × 70,881.40
  4. Step 4: Simplify right side
    81,249.40x = 8,638,606,831.74
  5. Step 5: Solve for x
    x = 8,638,606,831.74/81,249.40
  6. Step 6: Final answer
    x = 106,322.10

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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.