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Finding the Fourth Proportional to 20,861.15, 31,291.88 and 7,010.15

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Solution

The fourth proportional to 20,861.15, 31,291.88 and 7,010.15 is: 10,515.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.15 : 31,291.88 = 7,010.15 : x
  2. Step 2: Convert to fraction form
    20,861.15/31,291.88 = 7,010.15/x
  3. Step 3: Cross multiply
    20,861.15x = 31,291.88 × 7,010.15
  4. Step 4: Simplify right side
    20,861.15x = 219,360,581.07
  5. Step 5: Solve for x
    x = 219,360,581.07/20,861.15
  6. Step 6: Final answer
    x = 10,515.27

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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.