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Finding the Fourth Proportional to 207,321.84, 310,785.72 and 81,043.08

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Solution

The fourth proportional to 207,321.84, 310,785.72 and 81,043.08 is: 121,487.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,321.84 : 310,785.72 = 81,043.08 : x
  2. Step 2: Convert to fraction form
    207,321.84/310,785.72 = 81,043.08/x
  3. Step 3: Cross multiply
    207,321.84x = 310,785.72 × 81,043.08
  4. Step 4: Simplify right side
    207,321.84x = 25,187,031,968.82
  5. Step 5: Solve for x
    x = 25,187,031,968.82/207,321.84
  6. Step 6: Final answer
    x = 121,487.60

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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.