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Finding the Fourth Proportional to 561,079.12, 774,330.70 and 319,439.92

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Solution

The fourth proportional to 561,079.12, 774,330.70 and 319,439.92 is: 440,850.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    561,079.12 : 774,330.70 = 319,439.92 : x
  2. Step 2: Convert to fraction form
    561,079.12/774,330.70 = 319,439.92/x
  3. Step 3: Cross multiply
    561,079.12x = 774,330.70 × 319,439.92
  4. Step 4: Simplify right side
    561,079.12x = 247,352,136,861.54
  5. Step 5: Solve for x
    x = 247,352,136,861.54/561,079.12
  6. Step 6: Final answer
    x = 440,850.73

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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.