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Finding the Fourth Proportional to 873.33, 1,310.91 and 642.48

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Solution

The fourth proportional to 873.33, 1,310.91 and 642.48 is: 964.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.33 : 1,310.91 = 642.48 : x
  2. Step 2: Convert to fraction form
    873.33/1,310.91 = 642.48/x
  3. Step 3: Cross multiply
    873.33x = 1,310.91 × 642.48
  4. Step 4: Simplify right side
    873.33x = 842,233.46
  5. Step 5: Solve for x
    x = 842,233.46/873.33
  6. Step 6: Final answer
    x = 964.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.