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Finding the Fourth Proportional to 318,434.45, 477,656.55 and 81,771.89

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Solution

The fourth proportional to 318,434.45, 477,656.55 and 81,771.89 is: 122,659.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,434.45 : 477,656.55 = 81,771.89 : x
  2. Step 2: Convert to fraction form
    318,434.45/477,656.55 = 81,771.89/x
  3. Step 3: Cross multiply
    318,434.45x = 477,656.55 × 81,771.89
  4. Step 4: Simplify right side
    318,434.45x = 39,058,878,864.38
  5. Step 5: Solve for x
    x = 39,058,878,864.38/318,434.45
  6. Step 6: Final answer
    x = 122,659.09

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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.