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Finding the Fourth Proportional to 386,319.70, 579,479.55 and 327,999.70

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Solution

The fourth proportional to 386,319.70, 579,479.55 and 327,999.70 is: 491,999.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,319.70 : 579,479.55 = 327,999.70 : x
  2. Step 2: Convert to fraction form
    386,319.70/579,479.55 = 327,999.70/x
  3. Step 3: Cross multiply
    386,319.70x = 579,479.55 × 327,999.70
  4. Step 4: Simplify right side
    386,319.70x = 190,069,118,556.14
  5. Step 5: Solve for x
    x = 190,069,118,556.14/386,319.70
  6. Step 6: Final answer
    x = 491,999.55

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Similar ratio
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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.