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Finding the Fourth Proportional to 12,779.90, 17,636.46 and 7,190.90

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Solution

The fourth proportional to 12,779.90, 17,636.46 and 7,190.90 is: 9,923.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,779.90 : 17,636.46 = 7,190.90 : x
  2. Step 2: Convert to fraction form
    12,779.90/17,636.46 = 7,190.90/x
  3. Step 3: Cross multiply
    12,779.90x = 17,636.46 × 7,190.90
  4. Step 4: Simplify right side
    12,779.90x = 126,822,020.21
  5. Step 5: Solve for x
    x = 126,822,020.21/12,779.90
  6. Step 6: Final answer
    x = 9,923.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.