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Finding the Fourth Proportional to 128,557.54, 192,909.21 and 69,391.90

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Solution

The fourth proportional to 128,557.54, 192,909.21 and 69,391.90 is: 104,127.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,557.54 : 192,909.21 = 69,391.90 : x
  2. Step 2: Convert to fraction form
    128,557.54/192,909.21 = 69,391.90/x
  3. Step 3: Cross multiply
    128,557.54x = 192,909.21 × 69,391.90
  4. Step 4: Simplify right side
    128,557.54x = 13,386,336,609.40
  5. Step 5: Solve for x
    x = 13,386,336,609.40/128,557.54
  6. Step 6: Final answer
    x = 104,127.20

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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.