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Finding the Fourth Proportional to 318,495.51, 477,760.01 and 81,839.79

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Solution

The fourth proportional to 318,495.51, 477,760.01 and 81,839.79 is: 122,763.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,495.51 : 477,760.01 = 81,839.79 : x
  2. Step 2: Convert to fraction form
    318,495.51/477,760.01 = 81,839.79/x
  3. Step 3: Cross multiply
    318,495.51x = 477,760.01 × 81,839.79
  4. Step 4: Simplify right side
    318,495.51x = 39,099,778,479.60
  5. Step 5: Solve for x
    x = 39,099,778,479.60/318,495.51
  6. Step 6: Final answer
    x = 122,763.99

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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.