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Finding the Fourth Proportional to 258,269.76, 387,404.64 and 91,941.12

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Solution

The fourth proportional to 258,269.76, 387,404.64 and 91,941.12 is: 137,911.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,269.76 : 387,404.64 = 91,941.12 : x
  2. Step 2: Convert to fraction form
    258,269.76/387,404.64 = 91,941.12/x
  3. Step 3: Cross multiply
    258,269.76x = 387,404.64 × 91,941.12
  4. Step 4: Simplify right side
    258,269.76x = 35,618,416,494.80
  5. Step 5: Solve for x
    x = 35,618,416,494.80/258,269.76
  6. Step 6: Final answer
    x = 137,911.68

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1.5x scale

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.