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Finding the Fourth Proportional to 258,590.03, 387,889.11 and 81,098.57

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Solution

The fourth proportional to 258,590.03, 387,889.11 and 81,098.57 is: 121,649.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,590.03 : 387,889.11 = 81,098.57 : x
  2. Step 2: Convert to fraction form
    258,590.03/387,889.11 = 81,098.57/x
  3. Step 3: Cross multiply
    258,590.03x = 387,889.11 × 81,098.57
  4. Step 4: Simplify right side
    258,590.03x = 31,457,250,200.13
  5. Step 5: Solve for x
    x = 31,457,250,200.13/258,590.03
  6. Step 6: Final answer
    x = 121,649.12

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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.