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Finding the Fourth Proportional to 2,409.79, 3,614.81 and 678.55

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Solution

The fourth proportional to 2,409.79, 3,614.81 and 678.55 is: 1,017.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,409.79 : 3,614.81 = 678.55 : x
  2. Step 2: Convert to fraction form
    2,409.79/3,614.81 = 678.55/x
  3. Step 3: Cross multiply
    2,409.79x = 3,614.81 × 678.55
  4. Step 4: Simplify right side
    2,409.79x = 2,452,829.33
  5. Step 5: Solve for x
    x = 2,452,829.33/2,409.79
  6. Step 6: Final answer
    x = 1,017.86

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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.