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Finding the Fourth Proportional to 316.12, 435.60 and 305.32

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Solution

The fourth proportional to 316.12, 435.60 and 305.32 is: 420.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.12 : 435.60 = 305.32 : x
  2. Step 2: Convert to fraction form
    316.12/435.60 = 305.32/x
  3. Step 3: Cross multiply
    316.12x = 435.60 × 305.32
  4. Step 4: Simplify right side
    316.12x = 132,997.39
  5. Step 5: Solve for x
    x = 132,997.39/316.12
  6. Step 6: Final answer
    x = 420.72

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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.