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Finding the Fourth Proportional to 513,718.78, 708,934.44 and 287,364.28

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Solution

The fourth proportional to 513,718.78, 708,934.44 and 287,364.28 is: 396,564.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,718.78 : 708,934.44 = 287,364.28 : x
  2. Step 2: Convert to fraction form
    513,718.78/708,934.44 = 287,364.28/x
  3. Step 3: Cross multiply
    513,718.78x = 708,934.44 × 287,364.28
  4. Step 4: Simplify right side
    513,718.78x = 203,722,434,917.80
  5. Step 5: Solve for x
    x = 203,722,434,917.80/513,718.78
  6. Step 6: Final answer
    x = 396,564.12

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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.