Home / 1,116.72-1,675.20-386.28

Finding the Fourth Proportional to 1,116.72, 1,675.20 and 386.28

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Solution

The fourth proportional to 1,116.72, 1,675.20 and 386.28 is: 579.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.72 : 1,675.20 = 386.28 : x
  2. Step 2: Convert to fraction form
    1,116.72/1,675.20 = 386.28/x
  3. Step 3: Cross multiply
    1,116.72x = 1,675.20 × 386.28
  4. Step 4: Simplify right side
    1,116.72x = 647,096.26
  5. Step 5: Solve for x
    x = 647,096.26/1,116.72
  6. Step 6: Final answer
    x = 579.46

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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.