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Finding the Fourth Proportional to 667,405.80, 921,031.78 and 365,580.20

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Solution

The fourth proportional to 667,405.80, 921,031.78 and 365,580.20 is: 504,507.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,405.80 : 921,031.78 = 365,580.20 : x
  2. Step 2: Convert to fraction form
    667,405.80/921,031.78 = 365,580.20/x
  3. Step 3: Cross multiply
    667,405.80x = 921,031.78 × 365,580.20
  4. Step 4: Simplify right side
    667,405.80x = 336,710,982,338.76
  5. Step 5: Solve for x
    x = 336,710,982,338.76/667,405.80
  6. Step 6: Final answer
    x = 504,507.13

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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.