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Finding the Fourth Proportional to 81,491.28, 112,436.28 and 47,027.28

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Solution

The fourth proportional to 81,491.28, 112,436.28 and 47,027.28 is: 64,885.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,491.28 : 112,436.28 = 47,027.28 : x
  2. Step 2: Convert to fraction form
    81,491.28/112,436.28 = 47,027.28/x
  3. Step 3: Cross multiply
    81,491.28x = 112,436.28 × 47,027.28
  4. Step 4: Simplify right side
    81,491.28x = 5,287,572,421.72
  5. Step 5: Solve for x
    x = 5,287,572,421.72/81,491.28
  6. Step 6: Final answer
    x = 64,885.13

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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.