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Finding the Fourth Proportional to 289.96, 431.63 and 285.64

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Solution

The fourth proportional to 289.96, 431.63 and 285.64 is: 425.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.96 : 431.63 = 285.64 : x
  2. Step 2: Convert to fraction form
    289.96/431.63 = 285.64/x
  3. Step 3: Cross multiply
    289.96x = 431.63 × 285.64
  4. Step 4: Simplify right side
    289.96x = 123,290.79
  5. Step 5: Solve for x
    x = 123,290.79/289.96
  6. Step 6: Final answer
    x = 425.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.