Home / 1,333.16-1,986.63-1,289.12

Finding the Fourth Proportional to 1,333.16, 1,986.63 and 1,289.12

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Solution

The fourth proportional to 1,333.16, 1,986.63 and 1,289.12 is: 1,920.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,333.16 : 1,986.63 = 1,289.12 : x
  2. Step 2: Convert to fraction form
    1,333.16/1,986.63 = 1,289.12/x
  3. Step 3: Cross multiply
    1,333.16x = 1,986.63 × 1,289.12
  4. Step 4: Simplify right side
    1,333.16x = 2,560,989.70
  5. Step 5: Solve for x
    x = 2,560,989.70/1,333.16
  6. Step 6: Final answer
    x = 1,920.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.