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Finding the Fourth Proportional to 654.18, 979.72 and 328.75

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Solution

The fourth proportional to 654.18, 979.72 and 328.75 is: 492.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.18 : 979.72 = 328.75 : x
  2. Step 2: Convert to fraction form
    654.18/979.72 = 328.75/x
  3. Step 3: Cross multiply
    654.18x = 979.72 × 328.75
  4. Step 4: Simplify right side
    654.18x = 322,082.95
  5. Step 5: Solve for x
    x = 322,082.95/654.18
  6. Step 6: Final answer
    x = 492.35

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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.