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Finding the Fourth Proportional to 219,321.20, 328,981.80 and 86,157.20

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Solution

The fourth proportional to 219,321.20, 328,981.80 and 86,157.20 is: 129,235.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,321.20 : 328,981.80 = 86,157.20 : x
  2. Step 2: Convert to fraction form
    219,321.20/328,981.80 = 86,157.20/x
  3. Step 3: Cross multiply
    219,321.20x = 328,981.80 × 86,157.20
  4. Step 4: Simplify right side
    219,321.20x = 28,344,150,738.96
  5. Step 5: Solve for x
    x = 28,344,150,738.96/219,321.20
  6. Step 6: Final answer
    x = 129,235.80

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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.