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Finding the Fourth Proportional to 19,210.40, 28,810.80 and 7,361.60

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Solution

The fourth proportional to 19,210.40, 28,810.80 and 7,361.60 is: 11,040.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,210.40 : 28,810.80 = 7,361.60 : x
  2. Step 2: Convert to fraction form
    19,210.40/28,810.80 = 7,361.60/x
  3. Step 3: Cross multiply
    19,210.40x = 28,810.80 × 7,361.60
  4. Step 4: Simplify right side
    19,210.40x = 212,093,585.28
  5. Step 5: Solve for x
    x = 212,093,585.28/19,210.40
  6. Step 6: Final answer
    x = 11,040.56

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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.