Home / 21,020.02-31,474.41-12,688.90

Finding the Fourth Proportional to 21,020.02, 31,474.41 and 12,688.90

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Solution

The fourth proportional to 21,020.02, 31,474.41 and 12,688.90 is: 18,999.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,020.02 : 31,474.41 = 12,688.90 : x
  2. Step 2: Convert to fraction form
    21,020.02/31,474.41 = 12,688.90/x
  3. Step 3: Cross multiply
    21,020.02x = 31,474.41 × 12,688.90
  4. Step 4: Simplify right side
    21,020.02x = 399,375,641.05
  5. Step 5: Solve for x
    x = 399,375,641.05/21,020.02
  6. Step 6: Final answer
    x = 18,999.77

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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.