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Finding the Fourth Proportional to 84,348.90, 126,486.90 and 42,212.70

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Solution

The fourth proportional to 84,348.90, 126,486.90 and 42,212.70 is: 63,300.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,348.90 : 126,486.90 = 42,212.70 : x
  2. Step 2: Convert to fraction form
    84,348.90/126,486.90 = 42,212.70/x
  3. Step 3: Cross multiply
    84,348.90x = 126,486.90 × 42,212.70
  4. Step 4: Simplify right side
    84,348.90x = 5,339,353,563.63
  5. Step 5: Solve for x
    x = 5,339,353,563.63/84,348.90
  6. Step 6: Final answer
    x = 63,300.81

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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.