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Finding the Fourth Proportional to 431.33, 595.05 and 287.65

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Solution

The fourth proportional to 431.33, 595.05 and 287.65 is: 396.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.33 : 595.05 = 287.65 : x
  2. Step 2: Convert to fraction form
    431.33/595.05 = 287.65/x
  3. Step 3: Cross multiply
    431.33x = 595.05 × 287.65
  4. Step 4: Simplify right side
    431.33x = 171,166.13
  5. Step 5: Solve for x
    x = 171,166.13/431.33
  6. Step 6: Final answer
    x = 396.83

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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.