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Finding the Fourth Proportional to 128,456.64, 192,703.14 and 39,717.90

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Solution

The fourth proportional to 128,456.64, 192,703.14 and 39,717.90 is: 59,582.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,456.64 : 192,703.14 = 39,717.90 : x
  2. Step 2: Convert to fraction form
    128,456.64/192,703.14 = 39,717.90/x
  3. Step 3: Cross multiply
    128,456.64x = 192,703.14 × 39,717.90
  4. Step 4: Simplify right side
    128,456.64x = 7,653,764,044.21
  5. Step 5: Solve for x
    x = 7,653,764,044.21/128,456.64
  6. Step 6: Final answer
    x = 59,582.47

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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.