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Finding the Fourth Proportional to 1,685.76, 2,528.64 and 1,393.92

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Solution

The fourth proportional to 1,685.76, 2,528.64 and 1,393.92 is: 2,090.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.76 : 2,528.64 = 1,393.92 : x
  2. Step 2: Convert to fraction form
    1,685.76/2,528.64 = 1,393.92/x
  3. Step 3: Cross multiply
    1,685.76x = 2,528.64 × 1,393.92
  4. Step 4: Simplify right side
    1,685.76x = 3,524,721.87
  5. Step 5: Solve for x
    x = 3,524,721.87/1,685.76
  6. Step 6: Final answer
    x = 2,090.88

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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.