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Finding the Fourth Proportional to 19,018.20, 28,527.30 and 7,921.20

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Solution

The fourth proportional to 19,018.20, 28,527.30 and 7,921.20 is: 11,881.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,018.20 : 28,527.30 = 7,921.20 : x
  2. Step 2: Convert to fraction form
    19,018.20/28,527.30 = 7,921.20/x
  3. Step 3: Cross multiply
    19,018.20x = 28,527.30 × 7,921.20
  4. Step 4: Simplify right side
    19,018.20x = 225,970,448.76
  5. Step 5: Solve for x
    x = 225,970,448.76/19,018.20
  6. Step 6: Final answer
    x = 11,881.80

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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.