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Finding the Fourth Proportional to 288.34, 429.74 and 287.89

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Solution

The fourth proportional to 288.34, 429.74 and 287.89 is: 429.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.34 : 429.74 = 287.89 : x
  2. Step 2: Convert to fraction form
    288.34/429.74 = 287.89/x
  3. Step 3: Cross multiply
    288.34x = 429.74 × 287.89
  4. Step 4: Simplify right side
    288.34x = 123,717.85
  5. Step 5: Solve for x
    x = 123,717.85/288.34
  6. Step 6: Final answer
    x = 429.07

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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.