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Finding the Fourth Proportional to 285,919.70, 428,879.55 and 128,455.70

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Solution

The fourth proportional to 285,919.70, 428,879.55 and 128,455.70 is: 192,683.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,919.70 : 428,879.55 = 128,455.70 : x
  2. Step 2: Convert to fraction form
    285,919.70/428,879.55 = 128,455.70/x
  3. Step 3: Cross multiply
    285,919.70x = 428,879.55 × 128,455.70
  4. Step 4: Simplify right side
    285,919.70x = 55,092,022,810.94
  5. Step 5: Solve for x
    x = 55,092,022,810.94/285,919.70
  6. Step 6: Final answer
    x = 192,683.55

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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.