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Finding the Fourth Proportional to 15,697.80, 21,656.84 and 8,979.84

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Solution

The fourth proportional to 15,697.80, 21,656.84 and 8,979.84 is: 12,388.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,697.80 : 21,656.84 = 8,979.84 : x
  2. Step 2: Convert to fraction form
    15,697.80/21,656.84 = 8,979.84/x
  3. Step 3: Cross multiply
    15,697.80x = 21,656.84 × 8,979.84
  4. Step 4: Simplify right side
    15,697.80x = 194,474,913.21
  5. Step 5: Solve for x
    x = 194,474,913.21/15,697.80
  6. Step 6: Final answer
    x = 12,388.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.