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Finding the Fourth Proportional to 391,912.54, 587,821.80 and 122,060.10

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Solution

The fourth proportional to 391,912.54, 587,821.80 and 122,060.10 is: 183,075.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,912.54 : 587,821.80 = 122,060.10 : x
  2. Step 2: Convert to fraction form
    391,912.54/587,821.80 = 122,060.10/x
  3. Step 3: Cross multiply
    391,912.54x = 587,821.80 × 122,060.10
  4. Step 4: Simplify right side
    391,912.54x = 71,749,587,690.18
  5. Step 5: Solve for x
    x = 71,749,587,690.18/391,912.54
  6. Step 6: Final answer
    x = 183,075.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.