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Finding the Fourth Proportional to 15,852.78, 21,877.02 and 8,779.32

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Solution

The fourth proportional to 15,852.78, 21,877.02 and 8,779.32 is: 12,115.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,852.78 : 21,877.02 = 8,779.32 : x
  2. Step 2: Convert to fraction form
    15,852.78/21,877.02 = 8,779.32/x
  3. Step 3: Cross multiply
    15,852.78x = 21,877.02 × 8,779.32
  4. Step 4: Simplify right side
    15,852.78x = 192,065,359.23
  5. Step 5: Solve for x
    x = 192,065,359.23/15,852.78
  6. Step 6: Final answer
    x = 12,115.56

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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.