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Finding the Fourth Proportional to 104,979, 145,130.22 and 100,572.60

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Solution

The fourth proportional to 104,979, 145,130.22 and 100,572.60 is: 139,038.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,979 : 145,130.22 = 100,572.60 : x
  2. Step 2: Convert to fraction form
    104,979/145,130.22 = 100,572.60/x
  3. Step 3: Cross multiply
    104,979x = 145,130.22 × 100,572.60
  4. Step 4: Simplify right side
    104,979x = 14,596,123,563.97
  5. Step 5: Solve for x
    x = 14,596,123,563.97/104,979
  6. Step 6: Final answer
    x = 139,038.51

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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.