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Finding the Fourth Proportional to 290,787.31, 436,180.47 and 91,123.03

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Solution

The fourth proportional to 290,787.31, 436,180.47 and 91,123.03 is: 136,684.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,787.31 : 436,180.47 = 91,123.03 : x
  2. Step 2: Convert to fraction form
    290,787.31/436,180.47 = 91,123.03/x
  3. Step 3: Cross multiply
    290,787.31x = 436,180.47 × 91,123.03
  4. Step 4: Simplify right side
    290,787.31x = 39,746,086,053.22
  5. Step 5: Solve for x
    x = 39,746,086,053.22/290,787.31
  6. Step 6: Final answer
    x = 136,684.39

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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.