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Finding the Fourth Proportional to 291,617.20, 437,371.80 and 81,211.60

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Solution

The fourth proportional to 291,617.20, 437,371.80 and 81,211.60 is: 121,802.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,617.20 : 437,371.80 = 81,211.60 : x
  2. Step 2: Convert to fraction form
    291,617.20/437,371.80 = 81,211.60/x
  3. Step 3: Cross multiply
    291,617.20x = 437,371.80 × 81,211.60
  4. Step 4: Simplify right side
    291,617.20x = 35,519,663,672.88
  5. Step 5: Solve for x
    x = 35,519,663,672.88/291,617.20
  6. Step 6: Final answer
    x = 121,802.36

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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.