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Finding the Fourth Proportional to 124.93, 172.34 and 78.36

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Solution

The fourth proportional to 124.93, 172.34 and 78.36 is: 108.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.93 : 172.34 = 78.36 : x
  2. Step 2: Convert to fraction form
    124.93/172.34 = 78.36/x
  3. Step 3: Cross multiply
    124.93x = 172.34 × 78.36
  4. Step 4: Simplify right side
    124.93x = 13,504.56
  5. Step 5: Solve for x
    x = 13,504.56/124.93
  6. Step 6: Final answer
    x = 108.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.