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Finding the Fourth Proportional to 486.03, 670.80 and 289.55

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Solution

The fourth proportional to 486.03, 670.80 and 289.55 is: 399.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.03 : 670.80 = 289.55 : x
  2. Step 2: Convert to fraction form
    486.03/670.80 = 289.55/x
  3. Step 3: Cross multiply
    486.03x = 670.80 × 289.55
  4. Step 4: Simplify right side
    486.03x = 194,226.79
  5. Step 5: Solve for x
    x = 194,226.79/486.03
  6. Step 6: Final answer
    x = 399.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.