Home / 1,218.67-1,827.80-438.51

Finding the Fourth Proportional to 1,218.67, 1,827.80 and 438.51

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Solution

The fourth proportional to 1,218.67, 1,827.80 and 438.51 is: 657.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.67 : 1,827.80 = 438.51 : x
  2. Step 2: Convert to fraction form
    1,218.67/1,827.80 = 438.51/x
  3. Step 3: Cross multiply
    1,218.67x = 1,827.80 × 438.51
  4. Step 4: Simplify right side
    1,218.67x = 801,507.48
  5. Step 5: Solve for x
    x = 801,507.48/1,218.67
  6. Step 6: Final answer
    x = 657.69

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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.