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Finding the Fourth Proportional to 121,075.56, 166,989.60 and 78,647.76

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Solution

The fourth proportional to 121,075.56, 166,989.60 and 78,647.76 is: 108,472.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,075.56 : 166,989.60 = 78,647.76 : x
  2. Step 2: Convert to fraction form
    121,075.56/166,989.60 = 78,647.76/x
  3. Step 3: Cross multiply
    121,075.56x = 166,989.60 × 78,647.76
  4. Step 4: Simplify right side
    121,075.56x = 13,133,357,983.30
  5. Step 5: Solve for x
    x = 13,133,357,983.30/121,075.56
  6. Step 6: Final answer
    x = 108,472.41

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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.