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Finding the Fourth Proportional to 431.67, 647.91 and 287.49

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Solution

The fourth proportional to 431.67, 647.91 and 287.49 is: 431.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.67 : 647.91 = 287.49 : x
  2. Step 2: Convert to fraction form
    431.67/647.91 = 287.49/x
  3. Step 3: Cross multiply
    431.67x = 647.91 × 287.49
  4. Step 4: Simplify right side
    431.67x = 186,267.65
  5. Step 5: Solve for x
    x = 186,267.65/431.67
  6. Step 6: Final answer
    x = 431.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.