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Finding the Fourth Proportional to 121,054.49, 166,986.93 and 72,644.03

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Solution

The fourth proportional to 121,054.49, 166,986.93 and 72,644.03 is: 100,207.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,054.49 : 166,986.93 = 72,644.03 : x
  2. Step 2: Convert to fraction form
    121,054.49/166,986.93 = 72,644.03/x
  3. Step 3: Cross multiply
    121,054.49x = 166,986.93 × 72,644.03
  4. Step 4: Simplify right side
    121,054.49x = 12,130,603,552.53
  5. Step 5: Solve for x
    x = 12,130,603,552.53/121,054.49
  6. Step 6: Final answer
    x = 100,207.80

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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.