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Finding the Fourth Proportional to 318,485.88, 477,729.18 and 81,830.52

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Solution

The fourth proportional to 318,485.88, 477,729.18 and 81,830.52 is: 122,745.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,485.88 : 477,729.18 = 81,830.52 : x
  2. Step 2: Convert to fraction form
    318,485.88/477,729.18 = 81,830.52/x
  3. Step 3: Cross multiply
    318,485.88x = 477,729.18 × 81,830.52
  4. Step 4: Simplify right side
    318,485.88x = 39,092,827,218.57
  5. Step 5: Solve for x
    x = 39,092,827,218.57/318,485.88
  6. Step 6: Final answer
    x = 122,745.87

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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.