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Finding the Fourth Proportional to 1,935.17, 2,902.76 and 685.74

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Solution

The fourth proportional to 1,935.17, 2,902.76 and 685.74 is: 1,028.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,935.17 : 2,902.76 = 685.74 : x
  2. Step 2: Convert to fraction form
    1,935.17/2,902.76 = 685.74/x
  3. Step 3: Cross multiply
    1,935.17x = 2,902.76 × 685.74
  4. Step 4: Simplify right side
    1,935.17x = 1,990,538.64
  5. Step 5: Solve for x
    x = 1,990,538.64/1,935.17
  6. Step 6: Final answer
    x = 1,028.61

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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.