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Finding the Fourth Proportional to 429,698.52, 643,662.05 and 251,665.79

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Solution

The fourth proportional to 429,698.52, 643,662.05 and 251,665.79 is: 376,979.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,698.52 : 643,662.05 = 251,665.79 : x
  2. Step 2: Convert to fraction form
    429,698.52/643,662.05 = 251,665.79/x
  3. Step 3: Cross multiply
    429,698.52x = 643,662.05 × 251,665.79
  4. Step 4: Simplify right side
    429,698.52x = 161,987,713,829.63
  5. Step 5: Solve for x
    x = 161,987,713,829.63/429,698.52
  6. Step 6: Final answer
    x = 376,979.92

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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.