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Finding the Fourth Proportional to 258,432.40, 387,940.20 and 199,529.20

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Solution

The fourth proportional to 258,432.40, 387,940.20 and 199,529.20 is: 299,518.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,432.40 : 387,940.20 = 199,529.20 : x
  2. Step 2: Convert to fraction form
    258,432.40/387,940.20 = 199,529.20/x
  3. Step 3: Cross multiply
    258,432.40x = 387,940.20 × 199,529.20
  4. Step 4: Simplify right side
    258,432.40x = 77,405,397,753.84
  5. Step 5: Solve for x
    x = 77,405,397,753.84/258,432.40
  6. Step 6: Final answer
    x = 299,518.94

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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.