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Finding the Fourth Proportional to 654.63, 980.66 and 380.15

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Solution

The fourth proportional to 654.63, 980.66 and 380.15 is: 569.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.63 : 980.66 = 380.15 : x
  2. Step 2: Convert to fraction form
    654.63/980.66 = 380.15/x
  3. Step 3: Cross multiply
    654.63x = 980.66 × 380.15
  4. Step 4: Simplify right side
    654.63x = 372,793.00
  5. Step 5: Solve for x
    x = 372,793.00/654.63
  6. Step 6: Final answer
    x = 569.47

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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.