Home / 20,918.40-28,869.76-12,422.40

Finding the Fourth Proportional to 20,918.40, 28,869.76 and 12,422.40

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Solution

The fourth proportional to 20,918.40, 28,869.76 and 12,422.40 is: 17,144.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.40 : 28,869.76 = 12,422.40 : x
  2. Step 2: Convert to fraction form
    20,918.40/28,869.76 = 12,422.40/x
  3. Step 3: Cross multiply
    20,918.40x = 28,869.76 × 12,422.40
  4. Step 4: Simplify right side
    20,918.40x = 358,631,706.62
  5. Step 5: Solve for x
    x = 358,631,706.62/20,918.40
  6. Step 6: Final answer
    x = 17,144.32

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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.