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Finding the Fourth Proportional to 13,991.60, 20,987.40 and 4,629.10

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Solution

The fourth proportional to 13,991.60, 20,987.40 and 4,629.10 is: 6,943.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.60 : 20,987.40 = 4,629.10 : x
  2. Step 2: Convert to fraction form
    13,991.60/20,987.40 = 4,629.10/x
  3. Step 3: Cross multiply
    13,991.60x = 20,987.40 × 4,629.10
  4. Step 4: Simplify right side
    13,991.60x = 97,152,773.34
  5. Step 5: Solve for x
    x = 97,152,773.34/13,991.60
  6. Step 6: Final answer
    x = 6,943.65

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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.