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Finding the Fourth Proportional to 2,661.60, 3,672.24 and 1,821.60

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Solution

The fourth proportional to 2,661.60, 3,672.24 and 1,821.60 is: 2,513.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.60 : 3,672.24 = 1,821.60 : x
  2. Step 2: Convert to fraction form
    2,661.60/3,672.24 = 1,821.60/x
  3. Step 3: Cross multiply
    2,661.60x = 3,672.24 × 1,821.60
  4. Step 4: Simplify right side
    2,661.60x = 6,689,352.38
  5. Step 5: Solve for x
    x = 6,689,352.38/2,661.60
  6. Step 6: Final answer
    x = 2,513.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.