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Finding the Fourth Proportional to 280,279.90, 420,356.80 and 80,555.77

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Solution

The fourth proportional to 280,279.90, 420,356.80 and 80,555.77 is: 120,815.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,279.90 : 420,356.80 = 80,555.77 : x
  2. Step 2: Convert to fraction form
    280,279.90/420,356.80 = 80,555.77/x
  3. Step 3: Cross multiply
    280,279.90x = 420,356.80 × 80,555.77
  4. Step 4: Simplify right side
    280,279.90x = 33,862,165,698.74
  5. Step 5: Solve for x
    x = 33,862,165,698.74/280,279.90
  6. Step 6: Final answer
    x = 120,815.53

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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.