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Finding the Fourth Proportional to 955.98, 1,319.94 and 661.86

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Solution

The fourth proportional to 955.98, 1,319.94 and 661.86 is: 913.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.98 : 1,319.94 = 661.86 : x
  2. Step 2: Convert to fraction form
    955.98/1,319.94 = 661.86/x
  3. Step 3: Cross multiply
    955.98x = 1,319.94 × 661.86
  4. Step 4: Simplify right side
    955.98x = 873,615.49
  5. Step 5: Solve for x
    x = 873,615.49/955.98
  6. Step 6: Final answer
    x = 913.84

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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.