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Finding the Fourth Proportional to 19,620.40, 29,430.60 and 7,927.60

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Solution

The fourth proportional to 19,620.40, 29,430.60 and 7,927.60 is: 11,891.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,620.40 : 29,430.60 = 7,927.60 : x
  2. Step 2: Convert to fraction form
    19,620.40/29,430.60 = 7,927.60/x
  3. Step 3: Cross multiply
    19,620.40x = 29,430.60 × 7,927.60
  4. Step 4: Simplify right side
    19,620.40x = 233,314,024.56
  5. Step 5: Solve for x
    x = 233,314,024.56/19,620.40
  6. Step 6: Final answer
    x = 11,891.40

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1.5x scale

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.