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Finding the Fourth Proportional to 290,839.30, 436,264.42 and 91,155.28

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Solution

The fourth proportional to 290,839.30, 436,264.42 and 91,155.28 is: 136,734.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,839.30 : 436,264.42 = 91,155.28 : x
  2. Step 2: Convert to fraction form
    290,839.30/436,264.42 = 91,155.28/x
  3. Step 3: Cross multiply
    290,839.30x = 436,264.42 × 91,155.28
  4. Step 4: Simplify right side
    290,839.30x = 39,767,805,359.14
  5. Step 5: Solve for x
    x = 39,767,805,359.14/290,839.30
  6. Step 6: Final answer
    x = 136,734.63

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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.