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Finding the Fourth Proportional to 956.36, 1,434.72 and 661.12

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Solution

The fourth proportional to 956.36, 1,434.72 and 661.12 is: 991.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.36 : 1,434.72 = 661.12 : x
  2. Step 2: Convert to fraction form
    956.36/1,434.72 = 661.12/x
  3. Step 3: Cross multiply
    956.36x = 1,434.72 × 661.12
  4. Step 4: Simplify right side
    956.36x = 948,522.09
  5. Step 5: Solve for x
    x = 948,522.09/956.36
  6. Step 6: Final answer
    x = 991.80

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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.