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Finding the Fourth Proportional to 309,856.70, 427,992 and 255,605.46

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Solution

The fourth proportional to 309,856.70, 427,992 and 255,605.46 is: 353,057.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,856.70 : 427,992 = 255,605.46 : x
  2. Step 2: Convert to fraction form
    309,856.70/427,992 = 255,605.46/x
  3. Step 3: Cross multiply
    309,856.70x = 427,992 × 255,605.46
  4. Step 4: Simplify right side
    309,856.70x = 109,397,092,036.32
  5. Step 5: Solve for x
    x = 109,397,092,036.32/309,856.70
  6. Step 6: Final answer
    x = 353,057.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.