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Finding the Fourth Proportional to 258,771.71, 388,154.32 and 90,291.71

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Solution

The fourth proportional to 258,771.71, 388,154.32 and 90,291.71 is: 135,436.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,771.71 : 388,154.32 = 90,291.71 : x
  2. Step 2: Convert to fraction form
    258,771.71/388,154.32 = 90,291.71/x
  3. Step 3: Cross multiply
    258,771.71x = 388,154.32 × 90,291.71
  4. Step 4: Simplify right side
    258,771.71x = 35,047,117,296.69
  5. Step 5: Solve for x
    x = 35,047,117,296.69/258,771.71
  6. Step 6: Final answer
    x = 135,436.43

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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.