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Finding the Fourth Proportional to 341,992.80, 512,989.20 and 128,760.30

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Solution

The fourth proportional to 341,992.80, 512,989.20 and 128,760.30 is: 193,140.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    341,992.80 : 512,989.20 = 128,760.30 : x
  2. Step 2: Convert to fraction form
    341,992.80/512,989.20 = 128,760.30/x
  3. Step 3: Cross multiply
    341,992.80x = 512,989.20 × 128,760.30
  4. Step 4: Simplify right side
    341,992.80x = 66,052,643,288.76
  5. Step 5: Solve for x
    x = 66,052,643,288.76/341,992.80
  6. Step 6: Final answer
    x = 193,140.45

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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.