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Finding the Fourth Proportional to 290,810.87, 436,215.64 and 91,146.47

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Solution

The fourth proportional to 290,810.87, 436,215.64 and 91,146.47 is: 136,719.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,810.87 : 436,215.64 = 91,146.47 : x
  2. Step 2: Convert to fraction form
    290,810.87/436,215.64 = 91,146.47/x
  3. Step 3: Cross multiply
    290,810.87x = 436,215.64 × 91,146.47
  4. Step 4: Simplify right side
    290,810.87x = 39,759,515,744.79
  5. Step 5: Solve for x
    x = 39,759,515,744.79/290,810.87
  6. Step 6: Final answer
    x = 136,719.50

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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.