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Finding the Fourth Proportional to 443.52, 612.18 and 312.30

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Solution

The fourth proportional to 443.52, 612.18 and 312.30 is: 431.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.52 : 612.18 = 312.30 : x
  2. Step 2: Convert to fraction form
    443.52/612.18 = 312.30/x
  3. Step 3: Cross multiply
    443.52x = 612.18 × 312.30
  4. Step 4: Simplify right side
    443.52x = 191,183.81
  5. Step 5: Solve for x
    x = 191,183.81/443.52
  6. Step 6: Final answer
    x = 431.06

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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.