Home / 21,016.80-28,913.76-20,433.60

Finding the Fourth Proportional to 21,016.80, 28,913.76 and 20,433.60

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Solution

The fourth proportional to 21,016.80, 28,913.76 and 20,433.60 is: 28,111.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,016.80 : 28,913.76 = 20,433.60 : x
  2. Step 2: Convert to fraction form
    21,016.80/28,913.76 = 20,433.60/x
  3. Step 3: Cross multiply
    21,016.80x = 28,913.76 × 20,433.60
  4. Step 4: Simplify right side
    21,016.80x = 590,812,206.34
  5. Step 5: Solve for x
    x = 590,812,206.34/21,016.80
  6. Step 6: Final answer
    x = 28,111.43

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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.