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Finding the Fourth Proportional to 643,690.52, 888,302.60 and 357,229.16

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Solution

The fourth proportional to 643,690.52, 888,302.60 and 357,229.16 is: 492,981.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,690.52 : 888,302.60 = 357,229.16 : x
  2. Step 2: Convert to fraction form
    643,690.52/888,302.60 = 357,229.16/x
  3. Step 3: Cross multiply
    643,690.52x = 888,302.60 × 357,229.16
  4. Step 4: Simplify right side
    643,690.52x = 317,327,591,623.82
  5. Step 5: Solve for x
    x = 317,327,591,623.82/643,690.52
  6. Step 6: Final answer
    x = 492,981.61

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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.