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Finding the Fourth Proportional to 15,852.87, 21,877.43 and 8,779.41

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Solution

The fourth proportional to 15,852.87, 21,877.43 and 8,779.41 is: 12,115.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,852.87 : 21,877.43 = 8,779.41 : x
  2. Step 2: Convert to fraction form
    15,852.87/21,877.43 = 8,779.41/x
  3. Step 3: Cross multiply
    15,852.87x = 21,877.43 × 8,779.41
  4. Step 4: Simplify right side
    15,852.87x = 192,070,883.82
  5. Step 5: Solve for x
    x = 192,070,883.82/15,852.87
  6. Step 6: Final answer
    x = 12,115.84

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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.