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Finding the Fourth Proportional to 355,015.53, 489,920.27 and 211,781.61

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Solution

The fourth proportional to 355,015.53, 489,920.27 and 211,781.61 is: 292,257.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    355,015.53 : 489,920.27 = 211,781.61 : x
  2. Step 2: Convert to fraction form
    355,015.53/489,920.27 = 211,781.61/x
  3. Step 3: Cross multiply
    355,015.53x = 489,920.27 × 211,781.61
  4. Step 4: Simplify right side
    355,015.53x = 103,756,102,493.33
  5. Step 5: Solve for x
    x = 103,756,102,493.33/355,015.53
  6. Step 6: Final answer
    x = 292,257.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.