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Finding the Fourth Proportional to 954.88, 1,318.40 and 789.68

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Solution

The fourth proportional to 954.88, 1,318.40 and 789.68 is: 1,090.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.88 : 1,318.40 = 789.68 : x
  2. Step 2: Convert to fraction form
    954.88/1,318.40 = 789.68/x
  3. Step 3: Cross multiply
    954.88x = 1,318.40 × 789.68
  4. Step 4: Simplify right side
    954.88x = 1,041,114.11
  5. Step 5: Solve for x
    x = 1,041,114.11/954.88
  6. Step 6: Final answer
    x = 1,090.31

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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.