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Finding the Fourth Proportional to 956.99, 1,321.19 and 642.81

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Solution

The fourth proportional to 956.99, 1,321.19 and 642.81 is: 887.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.99 : 1,321.19 = 642.81 : x
  2. Step 2: Convert to fraction form
    956.99/1,321.19 = 642.81/x
  3. Step 3: Cross multiply
    956.99x = 1,321.19 × 642.81
  4. Step 4: Simplify right side
    956.99x = 849,270.93
  5. Step 5: Solve for x
    x = 849,270.93/956.99
  6. Step 6: Final answer
    x = 887.44

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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.