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Finding the Fourth Proportional to 115.07, 172.26 and 78.41

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Solution

The fourth proportional to 115.07, 172.26 and 78.41 is: 117.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.07 : 172.26 = 78.41 : x
  2. Step 2: Convert to fraction form
    115.07/172.26 = 78.41/x
  3. Step 3: Cross multiply
    115.07x = 172.26 × 78.41
  4. Step 4: Simplify right side
    115.07x = 13,507.34
  5. Step 5: Solve for x
    x = 13,507.34/115.07
  6. Step 6: Final answer
    x = 117.39

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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.