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Finding the Fourth Proportional to 13,800.30, 20,686.08 and 6,398.67

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Solution

The fourth proportional to 13,800.30, 20,686.08 and 6,398.67 is: 9,591.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,800.30 : 20,686.08 = 6,398.67 : x
  2. Step 2: Convert to fraction form
    13,800.30/20,686.08 = 6,398.67/x
  3. Step 3: Cross multiply
    13,800.30x = 20,686.08 × 6,398.67
  4. Step 4: Simplify right side
    13,800.30x = 132,363,399.51
  5. Step 5: Solve for x
    x = 132,363,399.51/13,800.30
  6. Step 6: Final answer
    x = 9,591.34

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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.