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Finding the Fourth Proportional to 128,971.76, 177,981.12 and 72,383.13

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Solution

The fourth proportional to 128,971.76, 177,981.12 and 72,383.13 is: 99,888.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,971.76 : 177,981.12 = 72,383.13 : x
  2. Step 2: Convert to fraction form
    128,971.76/177,981.12 = 72,383.13/x
  3. Step 3: Cross multiply
    128,971.76x = 177,981.12 × 72,383.13
  4. Step 4: Simplify right side
    128,971.76x = 12,882,830,546.51
  5. Step 5: Solve for x
    x = 12,882,830,546.51/128,971.76
  6. Step 6: Final answer
    x = 99,888.77

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