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Finding the Fourth Proportional to 955.11, 1,317.55 and 788.35

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Solution

The fourth proportional to 955.11, 1,317.55 and 788.35 is: 1,087.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.11 : 1,317.55 = 788.35 : x
  2. Step 2: Convert to fraction form
    955.11/1,317.55 = 788.35/x
  3. Step 3: Cross multiply
    955.11x = 1,317.55 × 788.35
  4. Step 4: Simplify right side
    955.11x = 1,038,690.54
  5. Step 5: Solve for x
    x = 1,038,690.54/955.11
  6. Step 6: Final answer
    x = 1,087.51

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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.