Home / 1,386.49-2,080.05-412.51

Finding the Fourth Proportional to 1,386.49, 2,080.05 and 412.51

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Solution

The fourth proportional to 1,386.49, 2,080.05 and 412.51 is: 618.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.49 : 2,080.05 = 412.51 : x
  2. Step 2: Convert to fraction form
    1,386.49/2,080.05 = 412.51/x
  3. Step 3: Cross multiply
    1,386.49x = 2,080.05 × 412.51
  4. Step 4: Simplify right side
    1,386.49x = 858,041.43
  5. Step 5: Solve for x
    x = 858,041.43/1,386.49
  6. Step 6: Final answer
    x = 618.86

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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.