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Finding the Fourth Proportional to 8,779.98, 12,119.25 and 6,990.72

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Solution

The fourth proportional to 8,779.98, 12,119.25 and 6,990.72 is: 9,649.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,779.98 : 12,119.25 = 6,990.72 : x
  2. Step 2: Convert to fraction form
    8,779.98/12,119.25 = 6,990.72/x
  3. Step 3: Cross multiply
    8,779.98x = 12,119.25 × 6,990.72
  4. Step 4: Simplify right side
    8,779.98x = 84,722,283.36
  5. Step 5: Solve for x
    x = 84,722,283.36/8,779.98
  6. Step 6: Final answer
    x = 9,649.48

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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.