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Finding the Fourth Proportional to 20,890.89, 31,341.24 and 7,039.89

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Solution

The fourth proportional to 20,890.89, 31,341.24 and 7,039.89 is: 10,561.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.89 : 31,341.24 = 7,039.89 : x
  2. Step 2: Convert to fraction form
    20,890.89/31,341.24 = 7,039.89/x
  3. Step 3: Cross multiply
    20,890.89x = 31,341.24 × 7,039.89
  4. Step 4: Simplify right side
    20,890.89x = 220,638,882.06
  5. Step 5: Solve for x
    x = 220,638,882.06/20,890.89
  6. Step 6: Final answer
    x = 10,561.49

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1.5x scale

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.