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Finding the Fourth Proportional to 128,638.72, 192,958.08 and 58,538.08

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Solution

The fourth proportional to 128,638.72, 192,958.08 and 58,538.08 is: 87,807.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,638.72 : 192,958.08 = 58,538.08 : x
  2. Step 2: Convert to fraction form
    128,638.72/192,958.08 = 58,538.08/x
  3. Step 3: Cross multiply
    128,638.72x = 192,958.08 × 58,538.08
  4. Step 4: Simplify right side
    128,638.72x = 11,295,395,523.69
  5. Step 5: Solve for x
    x = 11,295,395,523.69/128,638.72
  6. Step 6: Final answer
    x = 87,807.12

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1.5x scale

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.