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Finding the Fourth Proportional to 128,602.40, 192,874.80 and 84,538.40

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Solution

The fourth proportional to 128,602.40, 192,874.80 and 84,538.40 is: 126,788.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,602.40 : 192,874.80 = 84,538.40 : x
  2. Step 2: Convert to fraction form
    128,602.40/192,874.80 = 84,538.40/x
  3. Step 3: Cross multiply
    128,602.40x = 192,874.80 × 84,538.40
  4. Step 4: Simplify right side
    128,602.40x = 16,305,326,992.32
  5. Step 5: Solve for x
    x = 16,305,326,992.32/128,602.40
  6. Step 6: Final answer
    x = 126,788.67

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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.