Home / 1,143.13-1,577.59-645.79

Finding the Fourth Proportional to 1,143.13, 1,577.59 and 645.79

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Solution

The fourth proportional to 1,143.13, 1,577.59 and 645.79 is: 891.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.13 : 1,577.59 = 645.79 : x
  2. Step 2: Convert to fraction form
    1,143.13/1,577.59 = 645.79/x
  3. Step 3: Cross multiply
    1,143.13x = 1,577.59 × 645.79
  4. Step 4: Simplify right side
    1,143.13x = 1,018,791.85
  5. Step 5: Solve for x
    x = 1,018,791.85/1,143.13
  6. Step 6: Final answer
    x = 891.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.