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Finding the Fourth Proportional to 20,515.77, 30,762.72 and 10,645.11

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Solution

The fourth proportional to 20,515.77, 30,762.72 and 10,645.11 is: 15,961.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.77 : 30,762.72 = 10,645.11 : x
  2. Step 2: Convert to fraction form
    20,515.77/30,762.72 = 10,645.11/x
  3. Step 3: Cross multiply
    20,515.77x = 30,762.72 × 10,645.11
  4. Step 4: Simplify right side
    20,515.77x = 327,472,538.30
  5. Step 5: Solve for x
    x = 327,472,538.30/20,515.77
  6. Step 6: Final answer
    x = 15,961.99

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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.