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Finding the Fourth Proportional to 322.40, 482.86 and 285.46

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Solution

The fourth proportional to 322.40, 482.86 and 285.46 is: 427.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.40 : 482.86 = 285.46 : x
  2. Step 2: Convert to fraction form
    322.40/482.86 = 285.46/x
  3. Step 3: Cross multiply
    322.40x = 482.86 × 285.46
  4. Step 4: Simplify right side
    322.40x = 137,837.22
  5. Step 5: Solve for x
    x = 137,837.22/322.40
  6. Step 6: Final answer
    x = 427.53

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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.