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Finding the Fourth Proportional to 19,969.20, 28,015.20 and 19,969.20

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Solution

The fourth proportional to 19,969.20, 28,015.20 and 19,969.20 is: 28,015.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,969.20 : 28,015.20 = 19,969.20 : x
  2. Step 2: Convert to fraction form
    19,969.20/28,015.20 = 19,969.20/x
  3. Step 3: Cross multiply
    19,969.20x = 28,015.20 × 19,969.20
  4. Step 4: Simplify right side
    19,969.20x = 559,441,131.84
  5. Step 5: Solve for x
    x = 559,441,131.84/19,969.20
  6. Step 6: Final answer
    x = 28,015.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.