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Finding the Fourth Proportional to 956.56, 1,317.72 and 661.32

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Solution

The fourth proportional to 956.56, 1,317.72 and 661.32 is: 911.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.56 : 1,317.72 = 661.32 : x
  2. Step 2: Convert to fraction form
    956.56/1,317.72 = 661.32/x
  3. Step 3: Cross multiply
    956.56x = 1,317.72 × 661.32
  4. Step 4: Simplify right side
    956.56x = 871,434.59
  5. Step 5: Solve for x
    x = 871,434.59/956.56
  6. Step 6: Final answer
    x = 911.01

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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.