Home / 21,140.80-29,084.88-20,557.60

Finding the Fourth Proportional to 21,140.80, 29,084.88 and 20,557.60

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Solution

The fourth proportional to 21,140.80, 29,084.88 and 20,557.60 is: 28,282.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,140.80 : 29,084.88 = 20,557.60 : x
  2. Step 2: Convert to fraction form
    21,140.80/29,084.88 = 20,557.60/x
  3. Step 3: Cross multiply
    21,140.80x = 29,084.88 × 20,557.60
  4. Step 4: Simplify right side
    21,140.80x = 597,915,329.09
  5. Step 5: Solve for x
    x = 597,915,329.09/21,140.80
  6. Step 6: Final answer
    x = 28,282.53

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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.