Home / 1,386.32-2,079.75-412.34

Finding the Fourth Proportional to 1,386.32, 2,079.75 and 412.34

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Solution

The fourth proportional to 1,386.32, 2,079.75 and 412.34 is: 618.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.32 : 2,079.75 = 412.34 : x
  2. Step 2: Convert to fraction form
    1,386.32/2,079.75 = 412.34/x
  3. Step 3: Cross multiply
    1,386.32x = 2,079.75 × 412.34
  4. Step 4: Simplify right side
    1,386.32x = 857,564.12
  5. Step 5: Solve for x
    x = 857,564.12/1,386.32
  6. Step 6: Final answer
    x = 618.59

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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.