Home / 20,902.20-31,312.80-13,007.82

Finding the Fourth Proportional to 20,902.20, 31,312.80 and 13,007.82

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Solution

The fourth proportional to 20,902.20, 31,312.80 and 13,007.82 is: 19,486.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,902.20 : 31,312.80 = 13,007.82 : x
  2. Step 2: Convert to fraction form
    20,902.20/31,312.80 = 13,007.82/x
  3. Step 3: Cross multiply
    20,902.20x = 31,312.80 × 13,007.82
  4. Step 4: Simplify right side
    20,902.20x = 407,311,266.10
  5. Step 5: Solve for x
    x = 407,311,266.10/20,902.20
  6. Step 6: Final answer
    x = 19,486.53

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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.