Home / 20,961.40-31,442.12-5,379.04

Finding the Fourth Proportional to 20,961.40, 31,442.12 and 5,379.04

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Solution

The fourth proportional to 20,961.40, 31,442.12 and 5,379.04 is: 8,068.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961.40 : 31,442.12 = 5,379.04 : x
  2. Step 2: Convert to fraction form
    20,961.40/31,442.12 = 5,379.04/x
  3. Step 3: Cross multiply
    20,961.40x = 31,442.12 × 5,379.04
  4. Step 4: Simplify right side
    20,961.40x = 169,128,421.16
  5. Step 5: Solve for x
    x = 169,128,421.16/20,961.40
  6. Step 6: Final answer
    x = 8,068.57

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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.