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Finding the Fourth Proportional to 128,590.90, 192,878.92 and 38,631.67

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Solution

The fourth proportional to 128,590.90, 192,878.92 and 38,631.67 is: 57,945.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,590.90 : 192,878.92 = 38,631.67 : x
  2. Step 2: Convert to fraction form
    128,590.90/192,878.92 = 38,631.67/x
  3. Step 3: Cross multiply
    128,590.90x = 192,878.92 × 38,631.67
  4. Step 4: Simplify right side
    128,590.90x = 7,451,234,343.23
  5. Step 5: Solve for x
    x = 7,451,234,343.23/128,590.90
  6. Step 6: Final answer
    x = 57,945.27

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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.