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Finding the Fourth Proportional to 612.40, 918.06 and 323.56

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Solution

The fourth proportional to 612.40, 918.06 and 323.56 is: 485.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.40 : 918.06 = 323.56 : x
  2. Step 2: Convert to fraction form
    612.40/918.06 = 323.56/x
  3. Step 3: Cross multiply
    612.40x = 918.06 × 323.56
  4. Step 4: Simplify right side
    612.40x = 297,047.49
  5. Step 5: Solve for x
    x = 297,047.49/612.40
  6. Step 6: Final answer
    x = 485.05

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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.