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Finding the Fourth Proportional to 12,659.40, 18,991.80 and 6,420.24

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Solution

The fourth proportional to 12,659.40, 18,991.80 and 6,420.24 is: 9,631.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,659.40 : 18,991.80 = 6,420.24 : x
  2. Step 2: Convert to fraction form
    12,659.40/18,991.80 = 6,420.24/x
  3. Step 3: Cross multiply
    12,659.40x = 18,991.80 × 6,420.24
  4. Step 4: Simplify right side
    12,659.40x = 121,931,914.03
  5. Step 5: Solve for x
    x = 121,931,914.03/12,659.40
  6. Step 6: Final answer
    x = 9,631.73

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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.