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Finding the Fourth Proportional to 128,482.20, 192,612.48 and 61,830.64

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Solution

The fourth proportional to 128,482.20, 192,612.48 and 61,830.64 is: 92,692.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,482.20 : 192,612.48 = 61,830.64 : x
  2. Step 2: Convert to fraction form
    128,482.20/192,612.48 = 61,830.64/x
  3. Step 3: Cross multiply
    128,482.20x = 192,612.48 × 61,830.64
  4. Step 4: Simplify right side
    128,482.20x = 11,909,352,910.39
  5. Step 5: Solve for x
    x = 11,909,352,910.39/128,482.20
  6. Step 6: Final answer
    x = 92,692.63

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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.