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Finding the Fourth Proportional to 219,321.60, 328,982.40 and 86,206.20

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Solution

The fourth proportional to 219,321.60, 328,982.40 and 86,206.20 is: 129,309.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,321.60 : 328,982.40 = 86,206.20 : x
  2. Step 2: Convert to fraction form
    219,321.60/328,982.40 = 86,206.20/x
  3. Step 3: Cross multiply
    219,321.60x = 328,982.40 × 86,206.20
  4. Step 4: Simplify right side
    219,321.60x = 28,360,322,570.88
  5. Step 5: Solve for x
    x = 28,360,322,570.88/219,321.60
  6. Step 6: Final answer
    x = 129,309.30

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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.