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Finding the Fourth Proportional to 873.22, 1,310.28 and 386.31

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Solution

The fourth proportional to 873.22, 1,310.28 and 386.31 is: 579.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.22 : 1,310.28 = 386.31 : x
  2. Step 2: Convert to fraction form
    873.22/1,310.28 = 386.31/x
  3. Step 3: Cross multiply
    873.22x = 1,310.28 × 386.31
  4. Step 4: Simplify right side
    873.22x = 506,174.27
  5. Step 5: Solve for x
    x = 506,174.27/873.22
  6. Step 6: Final answer
    x = 579.66

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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.