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Finding the Fourth Proportional to 643,876.08, 888,505.92 and 389,367.60

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Solution

The fourth proportional to 643,876.08, 888,505.92 and 389,367.60 is: 537,301.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,876.08 : 888,505.92 = 389,367.60 : x
  2. Step 2: Convert to fraction form
    643,876.08/888,505.92 = 389,367.60/x
  3. Step 3: Cross multiply
    643,876.08x = 888,505.92 × 389,367.60
  4. Step 4: Simplify right side
    643,876.08x = 345,955,417,656.19
  5. Step 5: Solve for x
    x = 345,955,417,656.19/643,876.08
  6. Step 6: Final answer
    x = 537,301.24

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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.