Home / 1,206.29-1,664.75-911.05

Finding the Fourth Proportional to 1,206.29, 1,664.75 and 911.05

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Solution

The fourth proportional to 1,206.29, 1,664.75 and 911.05 is: 1,257.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.29 : 1,664.75 = 911.05 : x
  2. Step 2: Convert to fraction form
    1,206.29/1,664.75 = 911.05/x
  3. Step 3: Cross multiply
    1,206.29x = 1,664.75 × 911.05
  4. Step 4: Simplify right side
    1,206.29x = 1,516,668.60
  5. Step 5: Solve for x
    x = 1,516,668.60/1,206.29
  6. Step 6: Final answer
    x = 1,257.30

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1.5x scale

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.