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Finding the Fourth Proportional to 108,390.40, 162,585.60 and 75,212.80

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Solution

The fourth proportional to 108,390.40, 162,585.60 and 75,212.80 is: 112,819.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,390.40 : 162,585.60 = 75,212.80 : x
  2. Step 2: Convert to fraction form
    108,390.40/162,585.60 = 75,212.80/x
  3. Step 3: Cross multiply
    108,390.40x = 162,585.60 × 75,212.80
  4. Step 4: Simplify right side
    108,390.40x = 12,228,518,215.68
  5. Step 5: Solve for x
    x = 12,228,518,215.68/108,390.40
  6. Step 6: Final answer
    x = 112,819.20

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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.