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Finding the Fourth Proportional to 15,203.91, 20,978.89 and 8,488.46

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Solution

The fourth proportional to 15,203.91, 20,978.89 and 8,488.46 is: 11,712.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,203.91 : 20,978.89 = 8,488.46 : x
  2. Step 2: Convert to fraction form
    15,203.91/20,978.89 = 8,488.46/x
  3. Step 3: Cross multiply
    15,203.91x = 20,978.89 × 8,488.46
  4. Step 4: Simplify right side
    15,203.91x = 178,078,342.49
  5. Step 5: Solve for x
    x = 178,078,342.49/15,203.91
  6. Step 6: Final answer
    x = 11,712.67

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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.