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Finding the Fourth Proportional to 316.32, 438.30 and 312.36

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Solution

The fourth proportional to 316.32, 438.30 and 312.36 is: 432.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.32 : 438.30 = 312.36 : x
  2. Step 2: Convert to fraction form
    316.32/438.30 = 312.36/x
  3. Step 3: Cross multiply
    316.32x = 438.30 × 312.36
  4. Step 4: Simplify right side
    316.32x = 136,907.39
  5. Step 5: Solve for x
    x = 136,907.39/316.32
  6. Step 6: Final answer
    x = 432.81

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.