Home / 1,311.36-1,966.56-661.64

Finding the Fourth Proportional to 1,311.36, 1,966.56 and 661.64

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Solution

The fourth proportional to 1,311.36, 1,966.56 and 661.64 is: 992.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.36 : 1,966.56 = 661.64 : x
  2. Step 2: Convert to fraction form
    1,311.36/1,966.56 = 661.64/x
  3. Step 3: Cross multiply
    1,311.36x = 1,966.56 × 661.64
  4. Step 4: Simplify right side
    1,311.36x = 1,301,154.76
  5. Step 5: Solve for x
    x = 1,301,154.76/1,311.36
  6. Step 6: Final answer
    x = 992.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.