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Finding the Fourth Proportional to 643,893.81, 888,576.89 and 402,316.47

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Solution

The fourth proportional to 643,893.81, 888,576.89 and 402,316.47 is: 555,198.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,893.81 : 888,576.89 = 402,316.47 : x
  2. Step 2: Convert to fraction form
    643,893.81/888,576.89 = 402,316.47/x
  3. Step 3: Cross multiply
    643,893.81x = 888,576.89 × 402,316.47
  4. Step 4: Simplify right side
    643,893.81x = 357,489,115,696.80
  5. Step 5: Solve for x
    x = 357,489,115,696.80/643,893.81
  6. Step 6: Final answer
    x = 555,198.87

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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.