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Finding the Fourth Proportional to 290,818.92, 436,228.41 and 91,139.28

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Solution

The fourth proportional to 290,818.92, 436,228.41 and 91,139.28 is: 136,708.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,818.92 : 436,228.41 = 91,139.28 : x
  2. Step 2: Convert to fraction form
    290,818.92/436,228.41 = 91,139.28/x
  3. Step 3: Cross multiply
    290,818.92x = 436,228.41 × 91,139.28
  4. Step 4: Simplify right side
    290,818.92x = 39,757,543,202.94
  5. Step 5: Solve for x
    x = 39,757,543,202.94/290,818.92
  6. Step 6: Final answer
    x = 136,708.93

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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.