Home / 21,123.18-31,680.30-13,604.22

Finding the Fourth Proportional to 21,123.18, 31,680.30 and 13,604.22

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Solution

The fourth proportional to 21,123.18, 31,680.30 and 13,604.22 is: 20,403.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,123.18 : 31,680.30 = 13,604.22 : x
  2. Step 2: Convert to fraction form
    21,123.18/31,680.30 = 13,604.22/x
  3. Step 3: Cross multiply
    21,123.18x = 31,680.30 × 13,604.22
  4. Step 4: Simplify right side
    21,123.18x = 430,985,770.87
  5. Step 5: Solve for x
    x = 430,985,770.87/21,123.18
  6. Step 6: Final answer
    x = 20,403.45

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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.