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Finding the Fourth Proportional to 124.87, 172.35 and 78.25

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Solution

The fourth proportional to 124.87, 172.35 and 78.25 is: 108.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.87 : 172.35 = 78.25 : x
  2. Step 2: Convert to fraction form
    124.87/172.35 = 78.25/x
  3. Step 3: Cross multiply
    124.87x = 172.35 × 78.25
  4. Step 4: Simplify right side
    124.87x = 13,486.39
  5. Step 5: Solve for x
    x = 13,486.39/124.87
  6. Step 6: Final answer
    x = 108.00

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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.