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Finding the Fourth Proportional to 956.49, 1,320.61 and 642.23

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Solution

The fourth proportional to 956.49, 1,320.61 and 642.23 is: 886.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.49 : 1,320.61 = 642.23 : x
  2. Step 2: Convert to fraction form
    956.49/1,320.61 = 642.23/x
  3. Step 3: Cross multiply
    956.49x = 1,320.61 × 642.23
  4. Step 4: Simplify right side
    956.49x = 848,135.36
  5. Step 5: Solve for x
    x = 848,135.36/956.49
  6. Step 6: Final answer
    x = 886.72

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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.