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Finding the Fourth Proportional to 129,760.94, 179,070.12 and 73,172.31

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Solution

The fourth proportional to 129,760.94, 179,070.12 and 73,172.31 is: 100,977.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,760.94 : 179,070.12 = 73,172.31 : x
  2. Step 2: Convert to fraction form
    129,760.94/179,070.12 = 73,172.31/x
  3. Step 3: Cross multiply
    129,760.94x = 179,070.12 × 73,172.31
  4. Step 4: Simplify right side
    129,760.94x = 13,102,974,462.34
  5. Step 5: Solve for x
    x = 13,102,974,462.34/129,760.94
  6. Step 6: Final answer
    x = 100,977.80

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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.