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Finding the Fourth Proportional to 12,779.46, 19,127.88 and 7,858.98

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Solution

The fourth proportional to 12,779.46, 19,127.88 and 7,858.98 is: 11,763.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,779.46 : 19,127.88 = 7,858.98 : x
  2. Step 2: Convert to fraction form
    12,779.46/19,127.88 = 7,858.98/x
  3. Step 3: Cross multiply
    12,779.46x = 19,127.88 × 7,858.98
  4. Step 4: Simplify right side
    12,779.46x = 150,325,626.36
  5. Step 5: Solve for x
    x = 150,325,626.36/12,779.46
  6. Step 6: Final answer
    x = 11,763.07

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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.