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Finding the Fourth Proportional to 646.67, 970.17 and 321.79

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Solution

The fourth proportional to 646.67, 970.17 and 321.79 is: 482.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.67 : 970.17 = 321.79 : x
  2. Step 2: Convert to fraction form
    646.67/970.17 = 321.79/x
  3. Step 3: Cross multiply
    646.67x = 970.17 × 321.79
  4. Step 4: Simplify right side
    646.67x = 312,191.00
  5. Step 5: Solve for x
    x = 312,191.00/646.67
  6. Step 6: Final answer
    x = 482.77

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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.