Home / 20,731.65-28,621.35-13,670.37

Finding the Fourth Proportional to 20,731.65, 28,621.35 and 13,670.37

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Solution

The fourth proportional to 20,731.65, 28,621.35 and 13,670.37 is: 18,872.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,731.65 : 28,621.35 = 13,670.37 : x
  2. Step 2: Convert to fraction form
    20,731.65/28,621.35 = 13,670.37/x
  3. Step 3: Cross multiply
    20,731.65x = 28,621.35 × 13,670.37
  4. Step 4: Simplify right side
    20,731.65x = 391,264,444.40
  5. Step 5: Solve for x
    x = 391,264,444.40/20,731.65
  6. Step 6: Final answer
    x = 18,872.81

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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.