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Finding the Fourth Proportional to 869.65, 1,303.31 and 321.32

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Solution

The fourth proportional to 869.65, 1,303.31 and 321.32 is: 481.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.65 : 1,303.31 = 321.32 : x
  2. Step 2: Convert to fraction form
    869.65/1,303.31 = 321.32/x
  3. Step 3: Cross multiply
    869.65x = 1,303.31 × 321.32
  4. Step 4: Simplify right side
    869.65x = 418,779.57
  5. Step 5: Solve for x
    x = 418,779.57/869.65
  6. Step 6: Final answer
    x = 481.55

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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.