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Finding the Fourth Proportional to 3,128.88, 4,688.88 and 2,140.80

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Solution

The fourth proportional to 3,128.88, 4,688.88 and 2,140.80 is: 3,208.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.88 : 4,688.88 = 2,140.80 : x
  2. Step 2: Convert to fraction form
    3,128.88/4,688.88 = 2,140.80/x
  3. Step 3: Cross multiply
    3,128.88x = 4,688.88 × 2,140.80
  4. Step 4: Simplify right side
    3,128.88x = 10,037,954.30
  5. Step 5: Solve for x
    x = 10,037,954.30/3,128.88
  6. Step 6: Final answer
    x = 3,208.16

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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.