Home / 21,172.55-31,779.34-11,318.76

Finding the Fourth Proportional to 21,172.55, 31,779.34 and 11,318.76

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Solution

The fourth proportional to 21,172.55, 31,779.34 and 11,318.76 is: 16,989.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,172.55 : 31,779.34 = 11,318.76 : x
  2. Step 2: Convert to fraction form
    21,172.55/31,779.34 = 11,318.76/x
  3. Step 3: Cross multiply
    21,172.55x = 31,779.34 × 11,318.76
  4. Step 4: Simplify right side
    21,172.55x = 359,702,694.12
  5. Step 5: Solve for x
    x = 359,702,694.12/21,172.55
  6. Step 6: Final answer
    x = 16,989.11

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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.