Home / 1,218.40-1,827.36-438.56

Finding the Fourth Proportional to 1,218.40, 1,827.36 and 438.56

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Solution

The fourth proportional to 1,218.40, 1,827.36 and 438.56 is: 657.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.40 : 1,827.36 = 438.56 : x
  2. Step 2: Convert to fraction form
    1,218.40/1,827.36 = 438.56/x
  3. Step 3: Cross multiply
    1,218.40x = 1,827.36 × 438.56
  4. Step 4: Simplify right side
    1,218.40x = 801,407.00
  5. Step 5: Solve for x
    x = 801,407.00/1,218.40
  6. Step 6: Final answer
    x = 657.75

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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.