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Finding the Fourth Proportional to 2,687.78, 3,709.50 and 1,693.46

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Solution

The fourth proportional to 2,687.78, 3,709.50 and 1,693.46 is: 2,337.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,687.78 : 3,709.50 = 1,693.46 : x
  2. Step 2: Convert to fraction form
    2,687.78/3,709.50 = 1,693.46/x
  3. Step 3: Cross multiply
    2,687.78x = 3,709.50 × 1,693.46
  4. Step 4: Simplify right side
    2,687.78x = 6,281,889.87
  5. Step 5: Solve for x
    x = 6,281,889.87/2,687.78
  6. Step 6: Final answer
    x = 2,337.20

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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.