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Finding the Fourth Proportional to 252,859.40, 379,289.10 and 128,443.40

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Solution

The fourth proportional to 252,859.40, 379,289.10 and 128,443.40 is: 192,665.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    252,859.40 : 379,289.10 = 128,443.40 : x
  2. Step 2: Convert to fraction form
    252,859.40/379,289.10 = 128,443.40/x
  3. Step 3: Cross multiply
    252,859.40x = 379,289.10 × 128,443.40
  4. Step 4: Simplify right side
    252,859.40x = 48,717,181,586.94
  5. Step 5: Solve for x
    x = 48,717,181,586.94/252,859.40
  6. Step 6: Final answer
    x = 192,665.10

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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.