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Finding the Fourth Proportional to 210,490.51, 315,731.29 and 68,335.56

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Solution

The fourth proportional to 210,490.51, 315,731.29 and 68,335.56 is: 102,501.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,490.51 : 315,731.29 = 68,335.56 : x
  2. Step 2: Convert to fraction form
    210,490.51/315,731.29 = 68,335.56/x
  3. Step 3: Cross multiply
    210,490.51x = 315,731.29 × 68,335.56
  4. Step 4: Simplify right side
    210,490.51x = 21,575,674,511.67
  5. Step 5: Solve for x
    x = 21,575,674,511.67/210,490.51
  6. Step 6: Final answer
    x = 102,501.89

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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.