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Finding the Fourth Proportional to 13,459.01, 20,157.21 and 12,991.82

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Solution

The fourth proportional to 13,459.01, 20,157.21 and 12,991.82 is: 19,457.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,459.01 : 20,157.21 = 12,991.82 : x
  2. Step 2: Convert to fraction form
    13,459.01/20,157.21 = 12,991.82/x
  3. Step 3: Cross multiply
    13,459.01x = 20,157.21 × 12,991.82
  4. Step 4: Simplify right side
    13,459.01x = 261,878,844.02
  5. Step 5: Solve for x
    x = 261,878,844.02/13,459.01
  6. Step 6: Final answer
    x = 19,457.51

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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.