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Finding the Fourth Proportional to 893.56, 1,340.40 and 316.36

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Solution

The fourth proportional to 893.56, 1,340.40 and 316.36 is: 474.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.56 : 1,340.40 = 316.36 : x
  2. Step 2: Convert to fraction form
    893.56/1,340.40 = 316.36/x
  3. Step 3: Cross multiply
    893.56x = 1,340.40 × 316.36
  4. Step 4: Simplify right side
    893.56x = 424,048.94
  5. Step 5: Solve for x
    x = 424,048.94/893.56
  6. Step 6: Final answer
    x = 474.56

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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.