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Finding the Fourth Proportional to 280,289.32, 420,505.16 and 80,605.44

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Solution

The fourth proportional to 280,289.32, 420,505.16 and 80,605.44 is: 120,928.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,289.32 : 420,505.16 = 80,605.44 : x
  2. Step 2: Convert to fraction form
    280,289.32/420,505.16 = 80,605.44/x
  3. Step 3: Cross multiply
    280,289.32x = 420,505.16 × 80,605.44
  4. Step 4: Simplify right side
    280,289.32x = 33,895,003,444.07
  5. Step 5: Solve for x
    x = 33,895,003,444.07/280,289.32
  6. Step 6: Final answer
    x = 120,928.63

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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.