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Finding the Fourth Proportional to 291.78, 438.03 and 162.18

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Solution

The fourth proportional to 291.78, 438.03 and 162.18 is: 243.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.78 : 438.03 = 162.18 : x
  2. Step 2: Convert to fraction form
    291.78/438.03 = 162.18/x
  3. Step 3: Cross multiply
    291.78x = 438.03 × 162.18
  4. Step 4: Simplify right side
    291.78x = 71,039.71
  5. Step 5: Solve for x
    x = 71,039.71/291.78
  6. Step 6: Final answer
    x = 243.47

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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.