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Finding the Fourth Proportional to 1,666.80, 2,487.12 and 1,629.60

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Solution

The fourth proportional to 1,666.80, 2,487.12 and 1,629.60 is: 2,431.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,666.80 : 2,487.12 = 1,629.60 : x
  2. Step 2: Convert to fraction form
    1,666.80/2,487.12 = 1,629.60/x
  3. Step 3: Cross multiply
    1,666.80x = 2,487.12 × 1,629.60
  4. Step 4: Simplify right side
    1,666.80x = 4,053,010.75
  5. Step 5: Solve for x
    x = 4,053,010.75/1,666.80
  6. Step 6: Final answer
    x = 2,431.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.