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Finding the Fourth Proportional to 288.65, 431.42 and 265.59

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Solution

The fourth proportional to 288.65, 431.42 and 265.59 is: 396.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.65 : 431.42 = 265.59 : x
  2. Step 2: Convert to fraction form
    288.65/431.42 = 265.59/x
  3. Step 3: Cross multiply
    288.65x = 431.42 × 265.59
  4. Step 4: Simplify right side
    288.65x = 114,579.51
  5. Step 5: Solve for x
    x = 114,579.51/288.65
  6. Step 6: Final answer
    x = 396.96

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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.