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Finding the Fourth Proportional to 90,043.80, 134,871.30 and 74,491.80

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Solution

The fourth proportional to 90,043.80, 134,871.30 and 74,491.80 is: 111,576.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,043.80 : 134,871.30 = 74,491.80 : x
  2. Step 2: Convert to fraction form
    90,043.80/134,871.30 = 74,491.80/x
  3. Step 3: Cross multiply
    90,043.80x = 134,871.30 × 74,491.80
  4. Step 4: Simplify right side
    90,043.80x = 10,046,805,905.34
  5. Step 5: Solve for x
    x = 10,046,805,905.34/90,043.80
  6. Step 6: Final answer
    x = 111,576.88

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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.