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Finding the Fourth Proportional to 291,239.40, 436,859.10 and 80,879.40

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Solution

The fourth proportional to 291,239.40, 436,859.10 and 80,879.40 is: 121,319.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,239.40 : 436,859.10 = 80,879.40 : x
  2. Step 2: Convert to fraction form
    291,239.40/436,859.10 = 80,879.40/x
  3. Step 3: Cross multiply
    291,239.40x = 436,859.10 × 80,879.40
  4. Step 4: Simplify right side
    291,239.40x = 35,332,901,892.54
  5. Step 5: Solve for x
    x = 35,332,901,892.54/291,239.40
  6. Step 6: Final answer
    x = 121,319.10

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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.