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Finding the Fourth Proportional to 643,179.15, 887,641.74 and 356,791.50

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Solution

The fourth proportional to 643,179.15, 887,641.74 and 356,791.50 is: 492,402.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,179.15 : 887,641.74 = 356,791.50 : x
  2. Step 2: Convert to fraction form
    643,179.15/887,641.74 = 356,791.50/x
  3. Step 3: Cross multiply
    643,179.15x = 887,641.74 × 356,791.50
  4. Step 4: Simplify right side
    643,179.15x = 316,703,027,877.21
  5. Step 5: Solve for x
    x = 316,703,027,877.21/643,179.15
  6. Step 6: Final answer
    x = 492,402.51

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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.