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Finding the Fourth Proportional to 955.75, 1,317.68 and 623.60

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Solution

The fourth proportional to 955.75, 1,317.68 and 623.60 is: 859.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.75 : 1,317.68 = 623.60 : x
  2. Step 2: Convert to fraction form
    955.75/1,317.68 = 623.60/x
  3. Step 3: Cross multiply
    955.75x = 1,317.68 × 623.60
  4. Step 4: Simplify right side
    955.75x = 821,704.77
  5. Step 5: Solve for x
    x = 821,704.77/955.75
  6. Step 6: Final answer
    x = 859.75

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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.