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Finding the Fourth Proportional to 191.34, 285.72 and 172.89

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Solution

The fourth proportional to 191.34, 285.72 and 172.89 is: 258.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.34 : 285.72 = 172.89 : x
  2. Step 2: Convert to fraction form
    191.34/285.72 = 172.89/x
  3. Step 3: Cross multiply
    191.34x = 285.72 × 172.89
  4. Step 4: Simplify right side
    191.34x = 49,398.13
  5. Step 5: Solve for x
    x = 49,398.13/191.34
  6. Step 6: Final answer
    x = 258.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.