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Finding the Fourth Proportional to 2,643.92, 3,965.40 and 1,000.40

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Solution

The fourth proportional to 2,643.92, 3,965.40 and 1,000.40 is: 1,500.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,643.92 : 3,965.40 = 1,000.40 : x
  2. Step 2: Convert to fraction form
    2,643.92/3,965.40 = 1,000.40/x
  3. Step 3: Cross multiply
    2,643.92x = 3,965.40 × 1,000.40
  4. Step 4: Simplify right side
    2,643.92x = 3,966,986.16
  5. Step 5: Solve for x
    x = 3,966,986.16/2,643.92
  6. Step 6: Final answer
    x = 1,500.42

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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.