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Finding the Fourth Proportional to 257,906.10, 386,859.15 and 70,917.60

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Solution

The fourth proportional to 257,906.10, 386,859.15 and 70,917.60 is: 106,376.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,906.10 : 386,859.15 = 70,917.60 : x
  2. Step 2: Convert to fraction form
    257,906.10/386,859.15 = 70,917.60/x
  3. Step 3: Cross multiply
    257,906.10x = 386,859.15 × 70,917.60
  4. Step 4: Simplify right side
    257,906.10x = 27,435,122,456.04
  5. Step 5: Solve for x
    x = 27,435,122,456.04/257,906.10
  6. Step 6: Final answer
    x = 106,376.40

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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.