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Finding the Fourth Proportional to 210,696.71, 316,010.39 and 90,721.31

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Solution

The fourth proportional to 210,696.71, 316,010.39 and 90,721.31 is: 136,067.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,696.71 : 316,010.39 = 90,721.31 : x
  2. Step 2: Convert to fraction form
    210,696.71/316,010.39 = 90,721.31/x
  3. Step 3: Cross multiply
    210,696.71x = 316,010.39 × 90,721.31
  4. Step 4: Simplify right side
    210,696.71x = 28,668,874,520.75
  5. Step 5: Solve for x
    x = 28,668,874,520.75/210,696.71
  6. Step 6: Final answer
    x = 136,067.03

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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.