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Finding the Fourth Proportional to 869.35, 1,303.90 and 321.53

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Solution

The fourth proportional to 869.35, 1,303.90 and 321.53 is: 482.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.35 : 1,303.90 = 321.53 : x
  2. Step 2: Convert to fraction form
    869.35/1,303.90 = 321.53/x
  3. Step 3: Cross multiply
    869.35x = 1,303.90 × 321.53
  4. Step 4: Simplify right side
    869.35x = 419,242.97
  5. Step 5: Solve for x
    x = 419,242.97/869.35
  6. Step 6: Final answer
    x = 482.25

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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.