Home / 20,756.45-31,128.50-7,605.70

Finding the Fourth Proportional to 20,756.45, 31,128.50 and 7,605.70

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Solution

The fourth proportional to 20,756.45, 31,128.50 and 7,605.70 is: 11,406.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,756.45 : 31,128.50 = 7,605.70 : x
  2. Step 2: Convert to fraction form
    20,756.45/31,128.50 = 7,605.70/x
  3. Step 3: Cross multiply
    20,756.45x = 31,128.50 × 7,605.70
  4. Step 4: Simplify right side
    20,756.45x = 236,753,973.64
  5. Step 5: Solve for x
    x = 236,753,973.64/20,756.45
  6. Step 6: Final answer
    x = 11,406.28

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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.