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Finding the Fourth Proportional to 612,086.20, 918,129.30 and 543,851.80

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Solution

The fourth proportional to 612,086.20, 918,129.30 and 543,851.80 is: 815,777.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,086.20 : 918,129.30 = 543,851.80 : x
  2. Step 2: Convert to fraction form
    612,086.20/918,129.30 = 543,851.80/x
  3. Step 3: Cross multiply
    612,086.20x = 918,129.30 × 543,851.80
  4. Step 4: Simplify right side
    612,086.20x = 499,326,272,437.74
  5. Step 5: Solve for x
    x = 499,326,272,437.74/612,086.20
  6. Step 6: Final answer
    x = 815,777.70

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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.