Home / 13,208.72-18,213.39-8,421.08

Finding the Fourth Proportional to 13,208.72, 18,213.39 and 8,421.08

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Solution

The fourth proportional to 13,208.72, 18,213.39 and 8,421.08 is: 11,611.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,208.72 : 18,213.39 = 8,421.08 : x
  2. Step 2: Convert to fraction form
    13,208.72/18,213.39 = 8,421.08/x
  3. Step 3: Cross multiply
    13,208.72x = 18,213.39 × 8,421.08
  4. Step 4: Simplify right side
    13,208.72x = 153,376,323.19
  5. Step 5: Solve for x
    x = 153,376,323.19/13,208.72
  6. Step 6: Final answer
    x = 11,611.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.