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Finding the Fourth Proportional to 1,386.68, 2,080.37 and 412.79

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Solution

The fourth proportional to 1,386.68, 2,080.37 and 412.79 is: 619.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.68 : 2,080.37 = 412.79 : x
  2. Step 2: Convert to fraction form
    1,386.68/2,080.37 = 412.79/x
  3. Step 3: Cross multiply
    1,386.68x = 2,080.37 × 412.79
  4. Step 4: Simplify right side
    1,386.68x = 858,746.56
  5. Step 5: Solve for x
    x = 858,746.56/1,386.68
  6. Step 6: Final answer
    x = 619.28

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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.