Home / 1,126.08-1,690.20-639.54

Finding the Fourth Proportional to 1,126.08, 1,690.20 and 639.54

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Solution

The fourth proportional to 1,126.08, 1,690.20 and 639.54 is: 959.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.08 : 1,690.20 = 639.54 : x
  2. Step 2: Convert to fraction form
    1,126.08/1,690.20 = 639.54/x
  3. Step 3: Cross multiply
    1,126.08x = 1,690.20 × 639.54
  4. Step 4: Simplify right side
    1,126.08x = 1,080,950.51
  5. Step 5: Solve for x
    x = 1,080,950.51/1,126.08
  6. Step 6: Final answer
    x = 959.92

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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.