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Finding the Fourth Proportional to 955.95, 1,317.91 and 817.55

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Solution

The fourth proportional to 955.95, 1,317.91 and 817.55 is: 1,127.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.95 : 1,317.91 = 817.55 : x
  2. Step 2: Convert to fraction form
    955.95/1,317.91 = 817.55/x
  3. Step 3: Cross multiply
    955.95x = 1,317.91 × 817.55
  4. Step 4: Simplify right side
    955.95x = 1,077,457.32
  5. Step 5: Solve for x
    x = 1,077,457.32/955.95
  6. Step 6: Final answer
    x = 1,127.11

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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.