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Finding the Fourth Proportional to 955.39, 1,319.07 and 661.56

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Solution

The fourth proportional to 955.39, 1,319.07 and 661.56 is: 913.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.39 : 1,319.07 = 661.56 : x
  2. Step 2: Convert to fraction form
    955.39/1,319.07 = 661.56/x
  3. Step 3: Cross multiply
    955.39x = 1,319.07 × 661.56
  4. Step 4: Simplify right side
    955.39x = 872,640.64
  5. Step 5: Solve for x
    x = 872,640.64/955.39
  6. Step 6: Final answer
    x = 913.39

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1.5x scale

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.