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Finding the Fourth Proportional to 1,203.12, 1,660.68 and 811.08

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Solution

The fourth proportional to 1,203.12, 1,660.68 and 811.08 is: 1,119.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.12 : 1,660.68 = 811.08 : x
  2. Step 2: Convert to fraction form
    1,203.12/1,660.68 = 811.08/x
  3. Step 3: Cross multiply
    1,203.12x = 1,660.68 × 811.08
  4. Step 4: Simplify right side
    1,203.12x = 1,346,944.33
  5. Step 5: Solve for x
    x = 1,346,944.33/1,203.12
  6. Step 6: Final answer
    x = 1,119.54

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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.