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Finding the Fourth Proportional to 285,305.10, 427,979.52 and 85,610.94

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Solution

The fourth proportional to 285,305.10, 427,979.52 and 85,610.94 is: 128,422.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,305.10 : 427,979.52 = 85,610.94 : x
  2. Step 2: Convert to fraction form
    285,305.10/427,979.52 = 85,610.94/x
  3. Step 3: Cross multiply
    285,305.10x = 427,979.52 × 85,610.94
  4. Step 4: Simplify right side
    285,305.10x = 36,639,729,007.95
  5. Step 5: Solve for x
    x = 36,639,729,007.95/285,305.10
  6. Step 6: Final answer
    x = 128,422.97

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1.5x scale

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.