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Finding the Fourth Proportional to 955.19, 1,319.69 and 661.97

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Solution

The fourth proportional to 955.19, 1,319.69 and 661.97 is: 914.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.19 : 1,319.69 = 661.97 : x
  2. Step 2: Convert to fraction form
    955.19/1,319.69 = 661.97/x
  3. Step 3: Cross multiply
    955.19x = 1,319.69 × 661.97
  4. Step 4: Simplify right side
    955.19x = 873,600.14
  5. Step 5: Solve for x
    x = 873,600.14/955.19
  6. Step 6: Final answer
    x = 914.58

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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.