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Finding the Fourth Proportional to 265,672.80, 398,509.20 and 239,428.80

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Solution

The fourth proportional to 265,672.80, 398,509.20 and 239,428.80 is: 359,143.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,672.80 : 398,509.20 = 239,428.80 : x
  2. Step 2: Convert to fraction form
    265,672.80/398,509.20 = 239,428.80/x
  3. Step 3: Cross multiply
    265,672.80x = 398,509.20 × 239,428.80
  4. Step 4: Simplify right side
    265,672.80x = 95,414,579,544.96
  5. Step 5: Solve for x
    x = 95,414,579,544.96/265,672.80
  6. Step 6: Final answer
    x = 359,143.20

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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.