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Finding the Fourth Proportional to 386,213.64, 579,480.38 and 208,511.70

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Solution

The fourth proportional to 386,213.64, 579,480.38 and 208,511.70 is: 312,853.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,213.64 : 579,480.38 = 208,511.70 : x
  2. Step 2: Convert to fraction form
    386,213.64/579,480.38 = 208,511.70/x
  3. Step 3: Cross multiply
    386,213.64x = 579,480.38 × 208,511.70
  4. Step 4: Simplify right side
    386,213.64x = 120,828,439,150.45
  5. Step 5: Solve for x
    x = 120,828,439,150.45/386,213.64
  6. Step 6: Final answer
    x = 312,853.89

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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.