Home / 21,731.03-29,989.53-12,779.36

Finding the Fourth Proportional to 21,731.03, 29,989.53 and 12,779.36

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Solution

The fourth proportional to 21,731.03, 29,989.53 and 12,779.36 is: 17,635.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,731.03 : 29,989.53 = 12,779.36 : x
  2. Step 2: Convert to fraction form
    21,731.03/29,989.53 = 12,779.36/x
  3. Step 3: Cross multiply
    21,731.03x = 29,989.53 × 12,779.36
  4. Step 4: Simplify right side
    21,731.03x = 383,246,850.15
  5. Step 5: Solve for x
    x = 383,246,850.15/21,731.03
  6. Step 6: Final answer
    x = 17,635.93

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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.