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Finding the Fourth Proportional to 19,321.20, 28,981.80 and 5,470.20

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Solution

The fourth proportional to 19,321.20, 28,981.80 and 5,470.20 is: 8,205.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,321.20 : 28,981.80 = 5,470.20 : x
  2. Step 2: Convert to fraction form
    19,321.20/28,981.80 = 5,470.20/x
  3. Step 3: Cross multiply
    19,321.20x = 28,981.80 × 5,470.20
  4. Step 4: Simplify right side
    19,321.20x = 158,536,242.36
  5. Step 5: Solve for x
    x = 158,536,242.36/19,321.20
  6. Step 6: Final answer
    x = 8,205.30

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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.