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Finding the Fourth Proportional to 806,640.80, 1,210,076.40 and 274,186.40

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Solution

The fourth proportional to 806,640.80, 1,210,076.40 and 274,186.40 is: 411,318.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    806,640.80 : 1,210,076.40 = 274,186.40 : x
  2. Step 2: Convert to fraction form
    806,640.80/1,210,076.40 = 274,186.40/x
  3. Step 3: Cross multiply
    806,640.80x = 1,210,076.40 × 274,186.40
  4. Step 4: Simplify right side
    806,640.80x = 331,786,491,840.96
  5. Step 5: Solve for x
    x = 331,786,491,840.96/806,640.80
  6. Step 6: Final answer
    x = 411,318.76

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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.