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Finding the Fourth Proportional to 15,779.41, 21,775.84 and 8,705.88

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Solution

The fourth proportional to 15,779.41, 21,775.84 and 8,705.88 is: 12,014.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,779.41 : 21,775.84 = 8,705.88 : x
  2. Step 2: Convert to fraction form
    15,779.41/21,775.84 = 8,705.88/x
  3. Step 3: Cross multiply
    15,779.41x = 21,775.84 × 8,705.88
  4. Step 4: Simplify right side
    15,779.41x = 189,577,828.17
  5. Step 5: Solve for x
    x = 189,577,828.17/15,779.41
  6. Step 6: Final answer
    x = 12,014.26

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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.