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Finding the Fourth Proportional to 1,659.42, 2,289.87 and 1,188

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Solution

The fourth proportional to 1,659.42, 2,289.87 and 1,188 is: 1,639.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.42 : 2,289.87 = 1,188 : x
  2. Step 2: Convert to fraction form
    1,659.42/2,289.87 = 1,188/x
  3. Step 3: Cross multiply
    1,659.42x = 2,289.87 × 1,188
  4. Step 4: Simplify right side
    1,659.42x = 2,720,365.56
  5. Step 5: Solve for x
    x = 2,720,365.56/1,659.42
  6. Step 6: Final answer
    x = 1,639.35

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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.