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Finding the Fourth Proportional to 13,660.58, 20,487.99 and 6,989.93

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Solution

The fourth proportional to 13,660.58, 20,487.99 and 6,989.93 is: 10,483.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,660.58 : 20,487.99 = 6,989.93 : x
  2. Step 2: Convert to fraction form
    13,660.58/20,487.99 = 6,989.93/x
  3. Step 3: Cross multiply
    13,660.58x = 20,487.99 × 6,989.93
  4. Step 4: Simplify right side
    13,660.58x = 143,209,577.22
  5. Step 5: Solve for x
    x = 143,209,577.22/13,660.58
  6. Step 6: Final answer
    x = 10,483.42

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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.