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Finding the Fourth Proportional to 115.08, 172.40 and 76.50

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Solution

The fourth proportional to 115.08, 172.40 and 76.50 is: 114.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.08 : 172.40 = 76.50 : x
  2. Step 2: Convert to fraction form
    115.08/172.40 = 76.50/x
  3. Step 3: Cross multiply
    115.08x = 172.40 × 76.50
  4. Step 4: Simplify right side
    115.08x = 13,188.60
  5. Step 5: Solve for x
    x = 13,188.60/115.08
  6. Step 6: Final answer
    x = 114.60

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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.