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Finding the Fourth Proportional to 386,111.70, 579,167.55 and 208,964.70

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Solution

The fourth proportional to 386,111.70, 579,167.55 and 208,964.70 is: 313,447.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,111.70 : 579,167.55 = 208,964.70 : x
  2. Step 2: Convert to fraction form
    386,111.70/579,167.55 = 208,964.70/x
  3. Step 3: Cross multiply
    386,111.70x = 579,167.55 × 208,964.70
  4. Step 4: Simplify right side
    386,111.70x = 121,025,573,335.49
  5. Step 5: Solve for x
    x = 121,025,573,335.49/386,111.70
  6. Step 6: Final answer
    x = 313,447.05

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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.