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Finding the Fourth Proportional to 893.20, 1,339.88 and 316.08

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Solution

The fourth proportional to 893.20, 1,339.88 and 316.08 is: 474.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.20 : 1,339.88 = 316.08 : x
  2. Step 2: Convert to fraction form
    893.20/1,339.88 = 316.08/x
  3. Step 3: Cross multiply
    893.20x = 1,339.88 × 316.08
  4. Step 4: Simplify right side
    893.20x = 423,509.27
  5. Step 5: Solve for x
    x = 423,509.27/893.20
  6. Step 6: Final answer
    x = 474.15

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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.