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Finding the Fourth Proportional to 1,693.60, 2,540.40 and 653.92

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Solution

The fourth proportional to 1,693.60, 2,540.40 and 653.92 is: 980.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,693.60 : 2,540.40 = 653.92 : x
  2. Step 2: Convert to fraction form
    1,693.60/2,540.40 = 653.92/x
  3. Step 3: Cross multiply
    1,693.60x = 2,540.40 × 653.92
  4. Step 4: Simplify right side
    1,693.60x = 1,661,218.37
  5. Step 5: Solve for x
    x = 1,661,218.37/1,693.60
  6. Step 6: Final answer
    x = 980.88

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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.