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Finding the Fourth Proportional to 873.64, 1,310.45 and 820.18

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Solution

The fourth proportional to 873.64, 1,310.45 and 820.18 is: 1,230.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.64 : 1,310.45 = 820.18 : x
  2. Step 2: Convert to fraction form
    873.64/1,310.45 = 820.18/x
  3. Step 3: Cross multiply
    873.64x = 1,310.45 × 820.18
  4. Step 4: Simplify right side
    873.64x = 1,074,801.97
  5. Step 5: Solve for x
    x = 1,074,801.97/873.64
  6. Step 6: Final answer
    x = 1,230.26

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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.