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Finding the Fourth Proportional to 312.16, 429.99 and 238.35

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Solution

The fourth proportional to 312.16, 429.99 and 238.35 is: 328.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.16 : 429.99 = 238.35 : x
  2. Step 2: Convert to fraction form
    312.16/429.99 = 238.35/x
  3. Step 3: Cross multiply
    312.16x = 429.99 × 238.35
  4. Step 4: Simplify right side
    312.16x = 102,488.12
  5. Step 5: Solve for x
    x = 102,488.12/312.16
  6. Step 6: Final answer
    x = 328.32

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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.