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Finding the Fourth Proportional to 643,188.15, 887,654.16 and 356,800.50

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Solution

The fourth proportional to 643,188.15, 887,654.16 and 356,800.50 is: 492,414.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,188.15 : 887,654.16 = 356,800.50 : x
  2. Step 2: Convert to fraction form
    643,188.15/887,654.16 = 356,800.50/x
  3. Step 3: Cross multiply
    643,188.15x = 887,654.16 × 356,800.50
  4. Step 4: Simplify right side
    643,188.15x = 316,715,448,115.08
  5. Step 5: Solve for x
    x = 316,715,448,115.08/643,188.15
  6. Step 6: Final answer
    x = 492,414.93

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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.