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Finding the Fourth Proportional to 1,386.42, 2,079.62 and 412.54

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Solution

The fourth proportional to 1,386.42, 2,079.62 and 412.54 is: 618.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.42 : 2,079.62 = 412.54 : x
  2. Step 2: Convert to fraction form
    1,386.42/2,079.62 = 412.54/x
  3. Step 3: Cross multiply
    1,386.42x = 2,079.62 × 412.54
  4. Step 4: Simplify right side
    1,386.42x = 857,926.43
  5. Step 5: Solve for x
    x = 857,926.43/1,386.42
  6. Step 6: Final answer
    x = 618.81

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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.