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Finding the Fourth Proportional to 290,721.29, 436,081.93 and 91,057.30

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Solution

The fourth proportional to 290,721.29, 436,081.93 and 91,057.30 is: 136,585.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,721.29 : 436,081.93 = 91,057.30 : x
  2. Step 2: Convert to fraction form
    290,721.29/436,081.93 = 91,057.30/x
  3. Step 3: Cross multiply
    290,721.29x = 436,081.93 × 91,057.30
  4. Step 4: Simplify right side
    290,721.29x = 39,708,441,806.74
  5. Step 5: Solve for x
    x = 39,708,441,806.74/290,721.29
  6. Step 6: Final answer
    x = 136,585.95

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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.