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Finding the Fourth Proportional to 81,493.28, 112,439.04 and 47,029.28

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Solution

The fourth proportional to 81,493.28, 112,439.04 and 47,029.28 is: 64,887.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,493.28 : 112,439.04 = 47,029.28 : x
  2. Step 2: Convert to fraction form
    81,493.28/112,439.04 = 47,029.28/x
  3. Step 3: Cross multiply
    81,493.28x = 112,439.04 × 47,029.28
  4. Step 4: Simplify right side
    81,493.28x = 5,287,927,095.09
  5. Step 5: Solve for x
    x = 5,287,927,095.09/81,493.28
  6. Step 6: Final answer
    x = 64,887.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.