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Finding the Fourth Proportional to 128,897.70, 192,799.80 and 115,666.35

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Solution

The fourth proportional to 128,897.70, 192,799.80 and 115,666.35 is: 173,008.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,897.70 : 192,799.80 = 115,666.35 : x
  2. Step 2: Convert to fraction form
    128,897.70/192,799.80 = 115,666.35/x
  3. Step 3: Cross multiply
    128,897.70x = 192,799.80 × 115,666.35
  4. Step 4: Simplify right side
    128,897.70x = 22,300,449,146.73
  5. Step 5: Solve for x
    x = 22,300,449,146.73/128,897.70
  6. Step 6: Final answer
    x = 173,008.90

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1.5x scale

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.