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Finding the Fourth Proportional to 643,892.78, 888,575.46 and 402,315.44

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Solution

The fourth proportional to 643,892.78, 888,575.46 and 402,315.44 is: 555,197.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,892.78 : 888,575.46 = 402,315.44 : x
  2. Step 2: Convert to fraction form
    643,892.78/888,575.46 = 402,315.44/x
  3. Step 3: Cross multiply
    643,892.78x = 888,575.46 × 402,315.44
  4. Step 4: Simplify right side
    643,892.78x = 357,487,622,720.23
  5. Step 5: Solve for x
    x = 357,487,622,720.23/643,892.78
  6. Step 6: Final answer
    x = 555,197.44

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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.