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Finding the Fourth Proportional to 643,362.90, 887,769.18 and 356,811.18

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Solution

The fourth proportional to 643,362.90, 887,769.18 and 356,811.18 is: 492,359.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,362.90 : 887,769.18 = 356,811.18 : x
  2. Step 2: Convert to fraction form
    643,362.90/887,769.18 = 356,811.18/x
  3. Step 3: Cross multiply
    643,362.90x = 887,769.18 × 356,811.18
  4. Step 4: Simplify right side
    643,362.90x = 316,765,968,683.43
  5. Step 5: Solve for x
    x = 316,765,968,683.43/643,362.90
  6. Step 6: Final answer
    x = 492,359.71

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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.