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Finding the Fourth Proportional to 518,427, 715,429.26 and 279,963

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Solution

The fourth proportional to 518,427, 715,429.26 and 279,963 is: 386,348.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,427 : 715,429.26 = 279,963 : x
  2. Step 2: Convert to fraction form
    518,427/715,429.26 = 279,963/x
  3. Step 3: Cross multiply
    518,427x = 715,429.26 × 279,963
  4. Step 4: Simplify right side
    518,427x = 200,293,721,917.38
  5. Step 5: Solve for x
    x = 200,293,721,917.38/518,427
  6. Step 6: Final answer
    x = 386,348.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.