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Finding the Fourth Proportional to 643,893.12, 888,528.04 and 357,390.66

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Solution

The fourth proportional to 643,893.12, 888,528.04 and 357,390.66 is: 493,174.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,893.12 : 888,528.04 = 357,390.66 : x
  2. Step 2: Convert to fraction form
    643,893.12/888,528.04 = 357,390.66/x
  3. Step 3: Cross multiply
    643,893.12x = 888,528.04 × 357,390.66
  4. Step 4: Simplify right side
    643,893.12x = 317,551,622,644.11
  5. Step 5: Solve for x
    x = 317,551,622,644.11/643,893.12
  6. Step 6: Final answer
    x = 493,174.43

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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.