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Finding the Fourth Proportional to 128,492.32, 192,388.56 and 99,930.10

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Solution

The fourth proportional to 128,492.32, 192,388.56 and 99,930.10 is: 149,623.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,492.32 : 192,388.56 = 99,930.10 : x
  2. Step 2: Convert to fraction form
    128,492.32/192,388.56 = 99,930.10/x
  3. Step 3: Cross multiply
    128,492.32x = 192,388.56 × 99,930.10
  4. Step 4: Simplify right side
    128,492.32x = 19,225,408,039.66
  5. Step 5: Solve for x
    x = 19,225,408,039.66/128,492.32
  6. Step 6: Final answer
    x = 149,623.01

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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.