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Finding the Fourth Proportional to 883.85, 1,322.81 and 815.05

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Solution

The fourth proportional to 883.85, 1,322.81 and 815.05 is: 1,219.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.85 : 1,322.81 = 815.05 : x
  2. Step 2: Convert to fraction form
    883.85/1,322.81 = 815.05/x
  3. Step 3: Cross multiply
    883.85x = 1,322.81 × 815.05
  4. Step 4: Simplify right side
    883.85x = 1,078,156.29
  5. Step 5: Solve for x
    x = 1,078,156.29/883.85
  6. Step 6: Final answer
    x = 1,219.84

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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.