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Finding the Fourth Proportional to 2,125.40, 3,188.10 and 1,639.40

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Solution

The fourth proportional to 2,125.40, 3,188.10 and 1,639.40 is: 2,459.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,125.40 : 3,188.10 = 1,639.40 : x
  2. Step 2: Convert to fraction form
    2,125.40/3,188.10 = 1,639.40/x
  3. Step 3: Cross multiply
    2,125.40x = 3,188.10 × 1,639.40
  4. Step 4: Simplify right side
    2,125.40x = 5,226,571.14
  5. Step 5: Solve for x
    x = 5,226,571.14/2,125.40
  6. Step 6: Final answer
    x = 2,459.10

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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.