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Finding the Fourth Proportional to 112,917.20, 169,030.20 and 81,813.20

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Solution

The fourth proportional to 112,917.20, 169,030.20 and 81,813.20 is: 122,469.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,917.20 : 169,030.20 = 81,813.20 : x
  2. Step 2: Convert to fraction form
    112,917.20/169,030.20 = 81,813.20/x
  3. Step 3: Cross multiply
    112,917.20x = 169,030.20 × 81,813.20
  4. Step 4: Simplify right side
    112,917.20x = 13,828,901,558.64
  5. Step 5: Solve for x
    x = 13,828,901,558.64/112,917.20
  6. Step 6: Final answer
    x = 122,469.40

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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.