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Finding the Fourth Proportional to 291,857.80, 437,786.70 and 81,495.40

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Solution

The fourth proportional to 291,857.80, 437,786.70 and 81,495.40 is: 122,243.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,857.80 : 437,786.70 = 81,495.40 : x
  2. Step 2: Convert to fraction form
    291,857.80/437,786.70 = 81,495.40/x
  3. Step 3: Cross multiply
    291,857.80x = 437,786.70 × 81,495.40
  4. Step 4: Simplify right side
    291,857.80x = 35,677,602,231.18
  5. Step 5: Solve for x
    x = 35,677,602,231.18/291,857.80
  6. Step 6: Final answer
    x = 122,243.10

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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.