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Finding the Fourth Proportional to 128,686.80, 193,044.60 and 39,939.60

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Solution

The fourth proportional to 128,686.80, 193,044.60 and 39,939.60 is: 59,913.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,686.80 : 193,044.60 = 39,939.60 : x
  2. Step 2: Convert to fraction form
    128,686.80/193,044.60 = 39,939.60/x
  3. Step 3: Cross multiply
    128,686.80x = 193,044.60 × 39,939.60
  4. Step 4: Simplify right side
    128,686.80x = 7,710,124,106.16
  5. Step 5: Solve for x
    x = 7,710,124,106.16/128,686.80
  6. Step 6: Final answer
    x = 59,913.87

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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.