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Finding the Fourth Proportional to 280,640.40, 420,960.60 and 140,672.40

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Solution

The fourth proportional to 280,640.40, 420,960.60 and 140,672.40 is: 211,008.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,640.40 : 420,960.60 = 140,672.40 : x
  2. Step 2: Convert to fraction form
    280,640.40/420,960.60 = 140,672.40/x
  3. Step 3: Cross multiply
    280,640.40x = 420,960.60 × 140,672.40
  4. Step 4: Simplify right side
    280,640.40x = 59,217,537,907.44
  5. Step 5: Solve for x
    x = 59,217,537,907.44/280,640.40
  6. Step 6: Final answer
    x = 211,008.60

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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.