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Finding the Fourth Proportional to 128,448.54, 177,262.47 and 71,859.42

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Solution

The fourth proportional to 128,448.54, 177,262.47 and 71,859.42 is: 99,167.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,448.54 : 177,262.47 = 71,859.42 : x
  2. Step 2: Convert to fraction form
    128,448.54/177,262.47 = 71,859.42/x
  3. Step 3: Cross multiply
    128,448.54x = 177,262.47 × 71,859.42
  4. Step 4: Simplify right side
    128,448.54x = 12,737,978,281.97
  5. Step 5: Solve for x
    x = 12,737,978,281.97/128,448.54
  6. Step 6: Final answer
    x = 99,167.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.