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Finding the Fourth Proportional to 612.88, 919.68 and 324.48

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Solution

The fourth proportional to 612.88, 919.68 and 324.48 is: 486.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.88 : 919.68 = 324.48 : x
  2. Step 2: Convert to fraction form
    612.88/919.68 = 324.48/x
  3. Step 3: Cross multiply
    612.88x = 919.68 × 324.48
  4. Step 4: Simplify right side
    612.88x = 298,417.77
  5. Step 5: Solve for x
    x = 298,417.77/612.88
  6. Step 6: Final answer
    x = 486.91

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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.