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Finding the Fourth Proportional to 1,228.29, 1,842.66 and 407.15

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Solution

The fourth proportional to 1,228.29, 1,842.66 and 407.15 is: 610.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.29 : 1,842.66 = 407.15 : x
  2. Step 2: Convert to fraction form
    1,228.29/1,842.66 = 407.15/x
  3. Step 3: Cross multiply
    1,228.29x = 1,842.66 × 407.15
  4. Step 4: Simplify right side
    1,228.29x = 750,236.98
  5. Step 5: Solve for x
    x = 750,236.98/1,228.29
  6. Step 6: Final answer
    x = 610.80

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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.