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Finding the Fourth Proportional to 639,969.28, 883,081.92 and 353,472.28

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Solution

The fourth proportional to 639,969.28, 883,081.92 and 353,472.28 is: 487,749.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,969.28 : 883,081.92 = 353,472.28 : x
  2. Step 2: Convert to fraction form
    639,969.28/883,081.92 = 353,472.28/x
  3. Step 3: Cross multiply
    639,969.28x = 883,081.92 × 353,472.28
  4. Step 4: Simplify right side
    639,969.28x = 312,144,979,689.18
  5. Step 5: Solve for x
    x = 312,144,979,689.18/639,969.28
  6. Step 6: Final answer
    x = 487,749.94

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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.