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Finding the Fourth Proportional to 128,807.20, 193,210.80 and 89,408.80

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Solution

The fourth proportional to 128,807.20, 193,210.80 and 89,408.80 is: 134,113.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,807.20 : 193,210.80 = 89,408.80 : x
  2. Step 2: Convert to fraction form
    128,807.20/193,210.80 = 89,408.80/x
  3. Step 3: Cross multiply
    128,807.20x = 193,210.80 × 89,408.80
  4. Step 4: Simplify right side
    128,807.20x = 17,274,745,775.04
  5. Step 5: Solve for x
    x = 17,274,745,775.04/128,807.20
  6. Step 6: Final answer
    x = 134,113.20

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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.