Home / 21,008.80-31,448.40-12,217.60

Finding the Fourth Proportional to 21,008.80, 31,448.40 and 12,217.60

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Solution

The fourth proportional to 21,008.80, 31,448.40 and 12,217.60 is: 18,288.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.80 : 31,448.40 = 12,217.60 : x
  2. Step 2: Convert to fraction form
    21,008.80/31,448.40 = 12,217.60/x
  3. Step 3: Cross multiply
    21,008.80x = 31,448.40 × 12,217.60
  4. Step 4: Simplify right side
    21,008.80x = 384,223,971.84
  5. Step 5: Solve for x
    x = 384,223,971.84/21,008.80
  6. Step 6: Final answer
    x = 18,288.72

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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.