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Finding the Fourth Proportional to 103,218.80, 154,633.80 and 53,128.40

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Solution

The fourth proportional to 103,218.80, 154,633.80 and 53,128.40 is: 79,592.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,218.80 : 154,633.80 = 53,128.40 : x
  2. Step 2: Convert to fraction form
    103,218.80/154,633.80 = 53,128.40/x
  3. Step 3: Cross multiply
    103,218.80x = 154,633.80 × 53,128.40
  4. Step 4: Simplify right side
    103,218.80x = 8,215,446,379.92
  5. Step 5: Solve for x
    x = 8,215,446,379.92/103,218.80
  6. Step 6: Final answer
    x = 79,592.54

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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.