Home / 1,121.18-1,681.64-758.30

Finding the Fourth Proportional to 1,121.18, 1,681.64 and 758.30

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Solution

The fourth proportional to 1,121.18, 1,681.64 and 758.30 is: 1,137.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.18 : 1,681.64 = 758.30 : x
  2. Step 2: Convert to fraction form
    1,121.18/1,681.64 = 758.30/x
  3. Step 3: Cross multiply
    1,121.18x = 1,681.64 × 758.30
  4. Step 4: Simplify right side
    1,121.18x = 1,275,187.61
  5. Step 5: Solve for x
    x = 1,275,187.61/1,121.18
  6. Step 6: Final answer
    x = 1,137.36

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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.