Home / 1,291.11-1,781.75-731.56

Finding the Fourth Proportional to 1,291.11, 1,781.75 and 731.56

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Solution

The fourth proportional to 1,291.11, 1,781.75 and 731.56 is: 1,009.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.11 : 1,781.75 = 731.56 : x
  2. Step 2: Convert to fraction form
    1,291.11/1,781.75 = 731.56/x
  3. Step 3: Cross multiply
    1,291.11x = 1,781.75 × 731.56
  4. Step 4: Simplify right side
    1,291.11x = 1,303,457.03
  5. Step 5: Solve for x
    x = 1,303,457.03/1,291.11
  6. Step 6: Final answer
    x = 1,009.56

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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.