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Finding the Fourth Proportional to 72,576.76, 108,865.68 and 19,989.13

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Solution

The fourth proportional to 72,576.76, 108,865.68 and 19,989.13 is: 29,983.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,576.76 : 108,865.68 = 19,989.13 : x
  2. Step 2: Convert to fraction form
    72,576.76/108,865.68 = 19,989.13/x
  3. Step 3: Cross multiply
    72,576.76x = 108,865.68 × 19,989.13
  4. Step 4: Simplify right side
    72,576.76x = 2,176,130,230.06
  5. Step 5: Solve for x
    x = 2,176,130,230.06/72,576.76
  6. Step 6: Final answer
    x = 29,983.84

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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.