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Finding the Fourth Proportional to 21,779.64, 32,672.16 and 6,989.58

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Solution

The fourth proportional to 21,779.64, 32,672.16 and 6,989.58 is: 10,485.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,779.64 : 32,672.16 = 6,989.58 : x
  2. Step 2: Convert to fraction form
    21,779.64/32,672.16 = 6,989.58/x
  3. Step 3: Cross multiply
    21,779.64x = 32,672.16 × 6,989.58
  4. Step 4: Simplify right side
    21,779.64x = 228,364,676.09
  5. Step 5: Solve for x
    x = 228,364,676.09/21,779.64
  6. Step 6: Final answer
    x = 10,485.24

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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.