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Finding the Fourth Proportional to 428,908.80, 642,925.80 and 251,324.40

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Solution

The fourth proportional to 428,908.80, 642,925.80 and 251,324.40 is: 376,730.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,908.80 : 642,925.80 = 251,324.40 : x
  2. Step 2: Convert to fraction form
    428,908.80/642,925.80 = 251,324.40/x
  3. Step 3: Cross multiply
    428,908.80x = 642,925.80 × 251,324.40
  4. Step 4: Simplify right side
    428,908.80x = 161,582,940,929.52
  5. Step 5: Solve for x
    x = 161,582,940,929.52/428,908.80
  6. Step 6: Final answer
    x = 376,730.30

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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.