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Finding the Fourth Proportional to 128,330, 192,495 and 53,485.40

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Solution

The fourth proportional to 128,330, 192,495 and 53,485.40 is: 80,228.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,330 : 192,495 = 53,485.40 : x
  2. Step 2: Convert to fraction form
    128,330/192,495 = 53,485.40/x
  3. Step 3: Cross multiply
    128,330x = 192,495 × 53,485.40
  4. Step 4: Simplify right side
    128,330x = 10,295,672,073
  5. Step 5: Solve for x
    x = 10,295,672,073/128,330
  6. Step 6: Final answer
    x = 80,228.10

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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.