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Finding the Fourth Proportional to 257,979.30, 386,968.95 and 68,439.30

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Solution

The fourth proportional to 257,979.30, 386,968.95 and 68,439.30 is: 102,658.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,979.30 : 386,968.95 = 68,439.30 : x
  2. Step 2: Convert to fraction form
    257,979.30/386,968.95 = 68,439.30/x
  3. Step 3: Cross multiply
    257,979.30x = 386,968.95 × 68,439.30
  4. Step 4: Simplify right side
    257,979.30x = 26,483,884,059.74
  5. Step 5: Solve for x
    x = 26,483,884,059.74/257,979.30
  6. Step 6: Final answer
    x = 102,658.95

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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.