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Finding the Fourth Proportional to 687,785.50, 949,231.50 and 385,979.50

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Solution

The fourth proportional to 687,785.50, 949,231.50 and 385,979.50 is: 532,700.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,785.50 : 949,231.50 = 385,979.50 : x
  2. Step 2: Convert to fraction form
    687,785.50/949,231.50 = 385,979.50/x
  3. Step 3: Cross multiply
    687,785.50x = 949,231.50 × 385,979.50
  4. Step 4: Simplify right side
    687,785.50x = 366,383,899,754.25
  5. Step 5: Solve for x
    x = 366,383,899,754.25/687,785.50
  6. Step 6: Final answer
    x = 532,700.82

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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.