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Finding the Fourth Proportional to 643,206.40, 887,677.96 and 356,818.80

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Solution

The fourth proportional to 643,206.40, 887,677.96 and 356,818.80 is: 492,439.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,206.40 : 887,677.96 = 356,818.80 : x
  2. Step 2: Convert to fraction form
    643,206.40/887,677.96 = 356,818.80/x
  3. Step 3: Cross multiply
    643,206.40x = 887,677.96 × 356,818.80
  4. Step 4: Simplify right side
    643,206.40x = 316,740,184,473.65
  5. Step 5: Solve for x
    x = 316,740,184,473.65/643,206.40
  6. Step 6: Final answer
    x = 492,439.42

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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.