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Finding the Fourth Proportional to 172.18, 257.64 and 99.68

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Solution

The fourth proportional to 172.18, 257.64 and 99.68 is: 149.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.18 : 257.64 = 99.68 : x
  2. Step 2: Convert to fraction form
    172.18/257.64 = 99.68/x
  3. Step 3: Cross multiply
    172.18x = 257.64 × 99.68
  4. Step 4: Simplify right side
    172.18x = 25,681.56
  5. Step 5: Solve for x
    x = 25,681.56/172.18
  6. Step 6: Final answer
    x = 149.16

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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.