Home / 1,386.26-2,079.69-399.07

Finding the Fourth Proportional to 1,386.26, 2,079.69 and 399.07

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Solution

The fourth proportional to 1,386.26, 2,079.69 and 399.07 is: 598.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.26 : 2,079.69 = 399.07 : x
  2. Step 2: Convert to fraction form
    1,386.26/2,079.69 = 399.07/x
  3. Step 3: Cross multiply
    1,386.26x = 2,079.69 × 399.07
  4. Step 4: Simplify right side
    1,386.26x = 829,936.69
  5. Step 5: Solve for x
    x = 829,936.69/1,386.26
  6. Step 6: Final answer
    x = 598.69

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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.