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Finding the Fourth Proportional to 128,498.40, 192,781.20 and 49,615.20

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Solution

The fourth proportional to 128,498.40, 192,781.20 and 49,615.20 is: 74,435.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,498.40 : 192,781.20 = 49,615.20 : x
  2. Step 2: Convert to fraction form
    128,498.40/192,781.20 = 49,615.20/x
  3. Step 3: Cross multiply
    128,498.40x = 192,781.20 × 49,615.20
  4. Step 4: Simplify right side
    128,498.40x = 9,564,877,794.24
  5. Step 5: Solve for x
    x = 9,564,877,794.24/128,498.40
  6. Step 6: Final answer
    x = 74,435.77

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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.