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Finding the Fourth Proportional to 120,558.84, 166,386.60 and 79,201.20

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Solution

The fourth proportional to 120,558.84, 166,386.60 and 79,201.20 is: 109,307.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,558.84 : 166,386.60 = 79,201.20 : x
  2. Step 2: Convert to fraction form
    120,558.84/166,386.60 = 79,201.20/x
  3. Step 3: Cross multiply
    120,558.84x = 166,386.60 × 79,201.20
  4. Step 4: Simplify right side
    120,558.84x = 13,178,018,383.92
  5. Step 5: Solve for x
    x = 13,178,018,383.92/120,558.84
  6. Step 6: Final answer
    x = 109,307.77

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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.