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Finding the Fourth Proportional to 258,588.99, 387,899.82 and 90,102.51

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Solution

The fourth proportional to 258,588.99, 387,899.82 and 90,102.51 is: 135,159.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,588.99 : 387,899.82 = 90,102.51 : x
  2. Step 2: Convert to fraction form
    258,588.99/387,899.82 = 90,102.51/x
  3. Step 3: Cross multiply
    258,588.99x = 387,899.82 × 90,102.51
  4. Step 4: Simplify right side
    258,588.99x = 34,950,747,410.55
  5. Step 5: Solve for x
    x = 34,950,747,410.55/258,588.99
  6. Step 6: Final answer
    x = 135,159.46

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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.