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Finding the Fourth Proportional to 291.93, 438.42 and 155.25

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Solution

The fourth proportional to 291.93, 438.42 and 155.25 is: 233.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.93 : 438.42 = 155.25 : x
  2. Step 2: Convert to fraction form
    291.93/438.42 = 155.25/x
  3. Step 3: Cross multiply
    291.93x = 438.42 × 155.25
  4. Step 4: Simplify right side
    291.93x = 68,062.51
  5. Step 5: Solve for x
    x = 68,062.51/291.93
  6. Step 6: Final answer
    x = 233.15

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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.