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Finding the Fourth Proportional to 386,308.30, 579,628.95 and 208,940.17

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Solution

The fourth proportional to 386,308.30, 579,628.95 and 208,940.17 is: 313,500.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,308.30 : 579,628.95 = 208,940.17 : x
  2. Step 2: Convert to fraction form
    386,308.30/579,628.95 = 208,940.17/x
  3. Step 3: Cross multiply
    386,308.30x = 579,628.95 × 208,940.17
  4. Step 4: Simplify right side
    386,308.30x = 121,107,771,349.92
  5. Step 5: Solve for x
    x = 121,107,771,349.92/386,308.30
  6. Step 6: Final answer
    x = 313,500.31

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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.