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Finding the Fourth Proportional to 10,999.76, 16,488.68 and 5,145.88

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Solution

The fourth proportional to 10,999.76, 16,488.68 and 5,145.88 is: 7,713.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,999.76 : 16,488.68 = 5,145.88 : x
  2. Step 2: Convert to fraction form
    10,999.76/16,488.68 = 5,145.88/x
  3. Step 3: Cross multiply
    10,999.76x = 16,488.68 × 5,145.88
  4. Step 4: Simplify right side
    10,999.76x = 84,848,768.64
  5. Step 5: Solve for x
    x = 84,848,768.64/10,999.76
  6. Step 6: Final answer
    x = 7,713.69

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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.