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Finding the Fourth Proportional to 115.74, 172.76 and 99.54

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Solution

The fourth proportional to 115.74, 172.76 and 99.54 is: 148.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.74 : 172.76 = 99.54 : x
  2. Step 2: Convert to fraction form
    115.74/172.76 = 99.54/x
  3. Step 3: Cross multiply
    115.74x = 172.76 × 99.54
  4. Step 4: Simplify right side
    115.74x = 17,196.03
  5. Step 5: Solve for x
    x = 17,196.03/115.74
  6. Step 6: Final answer
    x = 148.57

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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.