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Finding the Fourth Proportional to 1,386.79, 2,080.54 and 412.87

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Solution

The fourth proportional to 1,386.79, 2,080.54 and 412.87 is: 619.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.79 : 2,080.54 = 412.87 : x
  2. Step 2: Convert to fraction form
    1,386.79/2,080.54 = 412.87/x
  3. Step 3: Cross multiply
    1,386.79x = 2,080.54 × 412.87
  4. Step 4: Simplify right side
    1,386.79x = 858,992.55
  5. Step 5: Solve for x
    x = 858,992.55/1,386.79
  6. Step 6: Final answer
    x = 619.41

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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.