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Finding the Fourth Proportional to 258,123, 387,199.08 and 91,911

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Solution

The fourth proportional to 258,123, 387,199.08 and 91,911 is: 137,871.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,123 : 387,199.08 = 91,911 : x
  2. Step 2: Convert to fraction form
    258,123/387,199.08 = 91,911/x
  3. Step 3: Cross multiply
    258,123x = 387,199.08 × 91,911
  4. Step 4: Simplify right side
    258,123x = 35,587,854,641.88
  5. Step 5: Solve for x
    x = 35,587,854,641.88/258,123
  6. Step 6: Final answer
    x = 137,871.69

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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.