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Finding the Fourth Proportional to 15,779.70, 21,775.50 and 8,706.15

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Solution

The fourth proportional to 15,779.70, 21,775.50 and 8,706.15 is: 12,014.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,779.70 : 21,775.50 = 8,706.15 : x
  2. Step 2: Convert to fraction form
    15,779.70/21,775.50 = 8,706.15/x
  3. Step 3: Cross multiply
    15,779.70x = 21,775.50 × 8,706.15
  4. Step 4: Simplify right side
    15,779.70x = 189,580,769.33
  5. Step 5: Solve for x
    x = 189,580,769.33/15,779.70
  6. Step 6: Final answer
    x = 12,014.22

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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.