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Finding the Fourth Proportional to 155,780.97, 214,971.53 and 87,812.06

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Solution

The fourth proportional to 155,780.97, 214,971.53 and 87,812.06 is: 121,177.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,780.97 : 214,971.53 = 87,812.06 : x
  2. Step 2: Convert to fraction form
    155,780.97/214,971.53 = 87,812.06/x
  3. Step 3: Cross multiply
    155,780.97x = 214,971.53 × 87,812.06
  4. Step 4: Simplify right side
    155,780.97x = 18,877,091,376.73
  5. Step 5: Solve for x
    x = 18,877,091,376.73/155,780.97
  6. Step 6: Final answer
    x = 121,177.13

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Why These Related Problems?

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