Home / 21,009.68-31,512.60-12,239.12

Finding the Fourth Proportional to 21,009.68, 31,512.60 and 12,239.12

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Solution

The fourth proportional to 21,009.68, 31,512.60 and 12,239.12 is: 18,357.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.68 : 31,512.60 = 12,239.12 : x
  2. Step 2: Convert to fraction form
    21,009.68/31,512.60 = 12,239.12/x
  3. Step 3: Cross multiply
    21,009.68x = 31,512.60 × 12,239.12
  4. Step 4: Simplify right side
    21,009.68x = 385,686,492.91
  5. Step 5: Solve for x
    x = 385,686,492.91/21,009.68
  6. Step 6: Final answer
    x = 18,357.56

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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.