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Finding the Fourth Proportional to 387,589.61, 534,918 and 215,524.73

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Solution

The fourth proportional to 387,589.61, 534,918 and 215,524.73 is: 297,448.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,589.61 : 534,918 = 215,524.73 : x
  2. Step 2: Convert to fraction form
    387,589.61/534,918 = 215,524.73/x
  3. Step 3: Cross multiply
    387,589.61x = 534,918 × 215,524.73
  4. Step 4: Simplify right side
    387,589.61x = 115,288,054,847.55
  5. Step 5: Solve for x
    x = 115,288,054,847.55/387,589.61
  6. Step 6: Final answer
    x = 297,448.78

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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.