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Finding the Fourth Proportional to 426,866.49, 640,381.68 and 190,208.43

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Solution

The fourth proportional to 426,866.49, 640,381.68 and 190,208.43 is: 285,349.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,866.49 : 640,381.68 = 190,208.43 : x
  2. Step 2: Convert to fraction form
    426,866.49/640,381.68 = 190,208.43/x
  3. Step 3: Cross multiply
    426,866.49x = 640,381.68 × 190,208.43
  4. Step 4: Simplify right side
    426,866.49x = 121,805,993,953.56
  5. Step 5: Solve for x
    x = 121,805,993,953.56/426,866.49
  6. Step 6: Final answer
    x = 285,349.16

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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.