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Finding the Fourth Proportional to 919,686.78, 1,379,737.78 and 280,047.72

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Solution

The fourth proportional to 919,686.78, 1,379,737.78 and 280,047.72 is: 420,134.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    919,686.78 : 1,379,737.78 = 280,047.72 : x
  2. Step 2: Convert to fraction form
    919,686.78/1,379,737.78 = 280,047.72/x
  3. Step 3: Cross multiply
    919,686.78x = 1,379,737.78 × 280,047.72
  4. Step 4: Simplify right side
    919,686.78x = 386,392,419,486.86
  5. Step 5: Solve for x
    x = 386,392,419,486.86/919,686.78
  6. Step 6: Final answer
    x = 420,134.80

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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.