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Finding the Fourth Proportional to 893.12, 1,339.86 and 316.04

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Solution

The fourth proportional to 893.12, 1,339.86 and 316.04 is: 474.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.12 : 1,339.86 = 316.04 : x
  2. Step 2: Convert to fraction form
    893.12/1,339.86 = 316.04/x
  3. Step 3: Cross multiply
    893.12x = 1,339.86 × 316.04
  4. Step 4: Simplify right side
    893.12x = 423,449.35
  5. Step 5: Solve for x
    x = 423,449.35/893.12
  6. Step 6: Final answer
    x = 474.12

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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.