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Finding the Fourth Proportional to 955.16, 1,318.68 and 717.19

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Solution

The fourth proportional to 955.16, 1,318.68 and 717.19 is: 990.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.16 : 1,318.68 = 717.19 : x
  2. Step 2: Convert to fraction form
    955.16/1,318.68 = 717.19/x
  3. Step 3: Cross multiply
    955.16x = 1,318.68 × 717.19
  4. Step 4: Simplify right side
    955.16x = 945,740.81
  5. Step 5: Solve for x
    x = 945,740.81/955.16
  6. Step 6: Final answer
    x = 990.14

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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.