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Finding the Fourth Proportional to 512,999.10, 769,498.65 and 139,022.10

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Solution

The fourth proportional to 512,999.10, 769,498.65 and 139,022.10 is: 208,533.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    512,999.10 : 769,498.65 = 139,022.10 : x
  2. Step 2: Convert to fraction form
    512,999.10/769,498.65 = 139,022.10/x
  3. Step 3: Cross multiply
    512,999.10x = 769,498.65 × 139,022.10
  4. Step 4: Simplify right side
    512,999.10x = 106,977,318,270.17
  5. Step 5: Solve for x
    x = 106,977,318,270.17/512,999.10
  6. Step 6: Final answer
    x = 208,533.15

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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.