Home / 12,489.89-18,729.35-6,645.11

Finding the Fourth Proportional to 12,489.89, 18,729.35 and 6,645.11

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Solution

The fourth proportional to 12,489.89, 18,729.35 and 6,645.11 is: 9,964.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.89 : 18,729.35 = 6,645.11 : x
  2. Step 2: Convert to fraction form
    12,489.89/18,729.35 = 6,645.11/x
  3. Step 3: Cross multiply
    12,489.89x = 18,729.35 × 6,645.11
  4. Step 4: Simplify right side
    12,489.89x = 124,458,557.75
  5. Step 5: Solve for x
    x = 124,458,557.75/12,489.89
  6. Step 6: Final answer
    x = 9,964.74

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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.