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Finding the Fourth Proportional to 485.62, 669.93 and 289.02

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Solution

The fourth proportional to 485.62, 669.93 and 289.02 is: 398.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.62 : 669.93 = 289.02 : x
  2. Step 2: Convert to fraction form
    485.62/669.93 = 289.02/x
  3. Step 3: Cross multiply
    485.62x = 669.93 × 289.02
  4. Step 4: Simplify right side
    485.62x = 193,623.17
  5. Step 5: Solve for x
    x = 193,623.17/485.62
  6. Step 6: Final answer
    x = 398.71

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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.