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Finding the Fourth Proportional to 8,561.80, 12,813.90 and 7,870.60

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Solution

The fourth proportional to 8,561.80, 12,813.90 and 7,870.60 is: 11,779.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,561.80 : 12,813.90 = 7,870.60 : x
  2. Step 2: Convert to fraction form
    8,561.80/12,813.90 = 7,870.60/x
  3. Step 3: Cross multiply
    8,561.80x = 12,813.90 × 7,870.60
  4. Step 4: Simplify right side
    8,561.80x = 100,853,081.34
  5. Step 5: Solve for x
    x = 100,853,081.34/8,561.80
  6. Step 6: Final answer
    x = 11,779.43

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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.