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Finding the Fourth Proportional to 543,656.76, 815,513.31 and 138,852.78

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Solution

The fourth proportional to 543,656.76, 815,513.31 and 138,852.78 is: 208,286.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,656.76 : 815,513.31 = 138,852.78 : x
  2. Step 2: Convert to fraction form
    543,656.76/815,513.31 = 138,852.78/x
  3. Step 3: Cross multiply
    543,656.76x = 815,513.31 × 138,852.78
  4. Step 4: Simplify right side
    543,656.76x = 113,236,290,220.50
  5. Step 5: Solve for x
    x = 113,236,290,220.50/543,656.76
  6. Step 6: Final answer
    x = 208,286.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.