Home / 128,819.80-193,229.70-86,829.40

Finding the Fourth Proportional to 128,819.80, 193,229.70 and 86,829.40

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Solution

The fourth proportional to 128,819.80, 193,229.70 and 86,829.40 is: 130,244.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,819.80 : 193,229.70 = 86,829.40 : x
  2. Step 2: Convert to fraction form
    128,819.80/193,229.70 = 86,829.40/x
  3. Step 3: Cross multiply
    128,819.80x = 193,229.70 × 86,829.40
  4. Step 4: Simplify right side
    128,819.80x = 16,778,018,913.18
  5. Step 5: Solve for x
    x = 16,778,018,913.18/128,819.80
  6. Step 6: Final answer
    x = 130,244.10

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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.