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Finding the Fourth Proportional to 258,838.18, 388,260.16 and 90,358.72

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Solution

The fourth proportional to 258,838.18, 388,260.16 and 90,358.72 is: 135,539.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,838.18 : 388,260.16 = 90,358.72 : x
  2. Step 2: Convert to fraction form
    258,838.18/388,260.16 = 90,358.72/x
  3. Step 3: Cross multiply
    258,838.18x = 388,260.16 × 90,358.72
  4. Step 4: Simplify right side
    258,838.18x = 35,082,691,084.60
  5. Step 5: Solve for x
    x = 35,082,691,084.60/258,838.18
  6. Step 6: Final answer
    x = 135,539.09

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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.