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Finding the Fourth Proportional to 7,256.90, 10,890.20 and 2,639.90

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Solution

The fourth proportional to 7,256.90, 10,890.20 and 2,639.90 is: 3,961.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,256.90 : 10,890.20 = 2,639.90 : x
  2. Step 2: Convert to fraction form
    7,256.90/10,890.20 = 2,639.90/x
  3. Step 3: Cross multiply
    7,256.90x = 10,890.20 × 2,639.90
  4. Step 4: Simplify right side
    7,256.90x = 28,748,984.53
  5. Step 5: Solve for x
    x = 28,748,984.53/7,256.90
  6. Step 6: Final answer
    x = 3,961.61

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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.