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Finding the Fourth Proportional to 291,238.40, 436,857.60 and 80,878.40

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Solution

The fourth proportional to 291,238.40, 436,857.60 and 80,878.40 is: 121,317.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,238.40 : 436,857.60 = 80,878.40 : x
  2. Step 2: Convert to fraction form
    291,238.40/436,857.60 = 80,878.40/x
  3. Step 3: Cross multiply
    291,238.40x = 436,857.60 × 80,878.40
  4. Step 4: Simplify right side
    291,238.40x = 35,332,343,715.84
  5. Step 5: Solve for x
    x = 35,332,343,715.84/291,238.40
  6. Step 6: Final answer
    x = 121,317.60

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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.