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Finding the Fourth Proportional to 210,857.79, 290,983.41 and 115,364.87

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Solution

The fourth proportional to 210,857.79, 290,983.41 and 115,364.87 is: 159,203.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,857.79 : 290,983.41 = 115,364.87 : x
  2. Step 2: Convert to fraction form
    210,857.79/290,983.41 = 115,364.87/x
  3. Step 3: Cross multiply
    210,857.79x = 290,983.41 × 115,364.87
  4. Step 4: Simplify right side
    210,857.79x = 33,569,261,811.89
  5. Step 5: Solve for x
    x = 33,569,261,811.89/210,857.79
  6. Step 6: Final answer
    x = 159,203.33

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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.