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Finding the Fourth Proportional to 354,365.98, 489,143.55 and 211,170.94

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Solution

The fourth proportional to 354,365.98, 489,143.55 and 211,170.94 is: 291,486.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    354,365.98 : 489,143.55 = 211,170.94 : x
  2. Step 2: Convert to fraction form
    354,365.98/489,143.55 = 211,170.94/x
  3. Step 3: Cross multiply
    354,365.98x = 489,143.55 × 211,170.94
  4. Step 4: Simplify right side
    354,365.98x = 103,292,903,248.44
  5. Step 5: Solve for x
    x = 103,292,903,248.44/354,365.98
  6. Step 6: Final answer
    x = 291,486.51

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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.