Home / 1,441.12-1,988.60-811.51

Finding the Fourth Proportional to 1,441.12, 1,988.60 and 811.51

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Solution

The fourth proportional to 1,441.12, 1,988.60 and 811.51 is: 1,119.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,441.12 : 1,988.60 = 811.51 : x
  2. Step 2: Convert to fraction form
    1,441.12/1,988.60 = 811.51/x
  3. Step 3: Cross multiply
    1,441.12x = 1,988.60 × 811.51
  4. Step 4: Simplify right side
    1,441.12x = 1,613,768.79
  5. Step 5: Solve for x
    x = 1,613,768.79/1,441.12
  6. Step 6: Final answer
    x = 1,119.80

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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.