Home / 1,143.20-1,577.53-639.07

Finding the Fourth Proportional to 1,143.20, 1,577.53 and 639.07

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Solution

The fourth proportional to 1,143.20, 1,577.53 and 639.07 is: 881.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.20 : 1,577.53 = 639.07 : x
  2. Step 2: Convert to fraction form
    1,143.20/1,577.53 = 639.07/x
  3. Step 3: Cross multiply
    1,143.20x = 1,577.53 × 639.07
  4. Step 4: Simplify right side
    1,143.20x = 1,008,152.10
  5. Step 5: Solve for x
    x = 1,008,152.10/1,143.20
  6. Step 6: Final answer
    x = 881.87

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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.