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Finding the Fourth Proportional to 187,620.79, 258,955.80 and 172,489.49

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Solution

The fourth proportional to 187,620.79, 258,955.80 and 172,489.49 is: 238,071.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    187,620.79 : 258,955.80 = 172,489.49 : x
  2. Step 2: Convert to fraction form
    187,620.79/258,955.80 = 172,489.49/x
  3. Step 3: Cross multiply
    187,620.79x = 258,955.80 × 172,489.49
  4. Step 4: Simplify right side
    187,620.79x = 44,667,153,874.54
  5. Step 5: Solve for x
    x = 44,667,153,874.54/187,620.79
  6. Step 6: Final answer
    x = 238,071.45

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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.