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Finding the Fourth Proportional to 612.97, 919.91 and 288.56

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Solution

The fourth proportional to 612.97, 919.91 and 288.56 is: 433.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.97 : 919.91 = 288.56 : x
  2. Step 2: Convert to fraction form
    612.97/919.91 = 288.56/x
  3. Step 3: Cross multiply
    612.97x = 919.91 × 288.56
  4. Step 4: Simplify right side
    612.97x = 265,450.63
  5. Step 5: Solve for x
    x = 265,450.63/612.97
  6. Step 6: Final answer
    x = 433.06

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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.