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Finding the Fourth Proportional to 640,139.34, 883,409.82 and 353,677.56

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Solution

The fourth proportional to 640,139.34, 883,409.82 and 353,677.56 is: 488,084.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,139.34 : 883,409.82 = 353,677.56 : x
  2. Step 2: Convert to fraction form
    640,139.34/883,409.82 = 353,677.56/x
  3. Step 3: Cross multiply
    640,139.34x = 883,409.82 × 353,677.56
  4. Step 4: Simplify right side
    640,139.34x = 312,442,229,617.64
  5. Step 5: Solve for x
    x = 312,442,229,617.64/640,139.34
  6. Step 6: Final answer
    x = 488,084.72

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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.