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Finding the Fourth Proportional to 688,099.78, 949,571.13 and 386,291.62

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Solution

The fourth proportional to 688,099.78, 949,571.13 and 386,291.62 is: 533,078.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    688,099.78 : 949,571.13 = 386,291.62 : x
  2. Step 2: Convert to fraction form
    688,099.78/949,571.13 = 386,291.62/x
  3. Step 3: Cross multiply
    688,099.78x = 949,571.13 × 386,291.62
  4. Step 4: Simplify right side
    688,099.78x = 366,811,370,112.93
  5. Step 5: Solve for x
    x = 366,811,370,112.93/688,099.78
  6. Step 6: Final answer
    x = 533,078.75

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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.