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Finding the Fourth Proportional to 280,571.10, 420,856.65 and 140,279.10

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Solution

The fourth proportional to 280,571.10, 420,856.65 and 140,279.10 is: 210,418.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,571.10 : 420,856.65 = 140,279.10 : x
  2. Step 2: Convert to fraction form
    280,571.10/420,856.65 = 140,279.10/x
  3. Step 3: Cross multiply
    280,571.10x = 420,856.65 × 140,279.10
  4. Step 4: Simplify right side
    280,571.10x = 59,037,392,091.02
  5. Step 5: Solve for x
    x = 59,037,392,091.02/280,571.10
  6. Step 6: Final answer
    x = 210,418.65

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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.