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Finding the Fourth Proportional to 955, 1,318.98 and 643.96

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Solution

The fourth proportional to 955, 1,318.98 and 643.96 is: 889.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    955 : 1,318.98 = 643.96 : x
  2. Step 2: Convert to fraction form
    955/1,318.98 = 643.96/x
  3. Step 3: Cross multiply
    955x = 1,318.98 × 643.96
  4. Step 4: Simplify right side
    955x = 849,370.36
  5. Step 5: Solve for x
    x = 849,370.36/955
  6. Step 6: Final answer
    x = 889.39

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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.