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Finding the Fourth Proportional to 318,445.15, 477,672.51 and 81,782.59

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Solution

The fourth proportional to 318,445.15, 477,672.51 and 81,782.59 is: 122,675.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,445.15 : 477,672.51 = 81,782.59 : x
  2. Step 2: Convert to fraction form
    318,445.15/477,672.51 = 81,782.59/x
  3. Step 3: Cross multiply
    318,445.15x = 477,672.51 × 81,782.59
  4. Step 4: Simplify right side
    318,445.15x = 39,065,295,039.60
  5. Step 5: Solve for x
    x = 39,065,295,039.60/318,445.15
  6. Step 6: Final answer
    x = 122,675.11

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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.