Home / 1,289.14-1,918.20-1,284.82

Finding the Fourth Proportional to 1,289.14, 1,918.20 and 1,284.82

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Solution

The fourth proportional to 1,289.14, 1,918.20 and 1,284.82 is: 1,911.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.14 : 1,918.20 = 1,284.82 : x
  2. Step 2: Convert to fraction form
    1,289.14/1,918.20 = 1,284.82/x
  3. Step 3: Cross multiply
    1,289.14x = 1,918.20 × 1,284.82
  4. Step 4: Simplify right side
    1,289.14x = 2,464,541.72
  5. Step 5: Solve for x
    x = 2,464,541.72/1,289.14
  6. Step 6: Final answer
    x = 1,911.77

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1.5x scale

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.