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Finding the Fourth Proportional to 207,218.76, 310,865.72 and 85,639.49

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Solution

The fourth proportional to 207,218.76, 310,865.72 and 85,639.49 is: 128,474.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,218.76 : 310,865.72 = 85,639.49 : x
  2. Step 2: Convert to fraction form
    207,218.76/310,865.72 = 85,639.49/x
  3. Step 3: Cross multiply
    207,218.76x = 310,865.72 × 85,639.49
  4. Step 4: Simplify right side
    207,218.76x = 26,622,382,651.12
  5. Step 5: Solve for x
    x = 26,622,382,651.12/207,218.76
  6. Step 6: Final answer
    x = 128,474.77

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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.