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Finding the Fourth Proportional to 255,619.40, 383,601.90 and 143,299.40

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Solution

The fourth proportional to 255,619.40, 383,601.90 and 143,299.40 is: 215,045.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,619.40 : 383,601.90 = 143,299.40 : x
  2. Step 2: Convert to fraction form
    255,619.40/383,601.90 = 143,299.40/x
  3. Step 3: Cross multiply
    255,619.40x = 383,601.90 × 143,299.40
  4. Step 4: Simplify right side
    255,619.40x = 54,969,922,108.86
  5. Step 5: Solve for x
    x = 54,969,922,108.86/255,619.40
  6. Step 6: Final answer
    x = 215,045.97

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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.