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Finding the Fourth Proportional to 964.83, 1,445.48 and 861.09

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Solution

The fourth proportional to 964.83, 1,445.48 and 861.09 is: 1,290.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.83 : 1,445.48 = 861.09 : x
  2. Step 2: Convert to fraction form
    964.83/1,445.48 = 861.09/x
  3. Step 3: Cross multiply
    964.83x = 1,445.48 × 861.09
  4. Step 4: Simplify right side
    964.83x = 1,244,688.37
  5. Step 5: Solve for x
    x = 1,244,688.37/964.83
  6. Step 6: Final answer
    x = 1,290.06

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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.