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Finding the Fourth Proportional to 1,228.50, 1,842.75 and 316.50

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Solution

The fourth proportional to 1,228.50, 1,842.75 and 316.50 is: 474.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.50 : 1,842.75 = 316.50 : x
  2. Step 2: Convert to fraction form
    1,228.50/1,842.75 = 316.50/x
  3. Step 3: Cross multiply
    1,228.50x = 1,842.75 × 316.50
  4. Step 4: Simplify right side
    1,228.50x = 583,230.38
  5. Step 5: Solve for x
    x = 583,230.38/1,228.50
  6. Step 6: Final answer
    x = 474.75

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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.