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Finding the Fourth Proportional to 427,601.86, 641,506.47 and 128,081.86

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Solution

The fourth proportional to 427,601.86, 641,506.47 and 128,081.86 is: 192,153.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,601.86 : 641,506.47 = 128,081.86 : x
  2. Step 2: Convert to fraction form
    427,601.86/641,506.47 = 128,081.86/x
  3. Step 3: Cross multiply
    427,601.86x = 641,506.47 × 128,081.86
  4. Step 4: Simplify right side
    427,601.86x = 82,165,341,879.63
  5. Step 5: Solve for x
    x = 82,165,341,879.63/427,601.86
  6. Step 6: Final answer
    x = 192,153.85

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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.