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Finding the Fourth Proportional to 919,686.76, 1,379,737.72 and 280,047.68

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Solution

The fourth proportional to 919,686.76, 1,379,737.72 and 280,047.68 is: 420,134.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    919,686.76 : 1,379,737.72 = 280,047.68 : x
  2. Step 2: Convert to fraction form
    919,686.76/1,379,737.72 = 280,047.68/x
  3. Step 3: Cross multiply
    919,686.76x = 1,379,737.72 × 280,047.68
  4. Step 4: Simplify right side
    919,686.76x = 386,392,347,494.49
  5. Step 5: Solve for x
    x = 386,392,347,494.49/919,686.76
  6. Step 6: Final answer
    x = 420,134.73

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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.