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Finding the Fourth Proportional to 190.16, 285.28 and 172.08

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Solution

The fourth proportional to 190.16, 285.28 and 172.08 is: 258.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.16 : 285.28 = 172.08 : x
  2. Step 2: Convert to fraction form
    190.16/285.28 = 172.08/x
  3. Step 3: Cross multiply
    190.16x = 285.28 × 172.08
  4. Step 4: Simplify right side
    190.16x = 49,090.55
  5. Step 5: Solve for x
    x = 49,090.55/190.16
  6. Step 6: Final answer
    x = 258.16

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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.