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Finding the Fourth Proportional to 128,478.63, 192,793.88 and 71,600.02

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Solution

The fourth proportional to 128,478.63, 192,793.88 and 71,600.02 is: 107,442.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,478.63 : 192,793.88 = 71,600.02 : x
  2. Step 2: Convert to fraction form
    128,478.63/192,793.88 = 71,600.02/x
  3. Step 3: Cross multiply
    128,478.63x = 192,793.88 × 71,600.02
  4. Step 4: Simplify right side
    128,478.63x = 13,804,045,663.88
  5. Step 5: Solve for x
    x = 13,804,045,663.88/128,478.63
  6. Step 6: Final answer
    x = 107,442.35

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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.