Home / 129,669.10-178,936.45-72,314.31

Finding the Fourth Proportional to 129,669.10, 178,936.45 and 72,314.31

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Solution

The fourth proportional to 129,669.10, 178,936.45 and 72,314.31 is: 99,789.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,669.10 : 178,936.45 = 72,314.31 : x
  2. Step 2: Convert to fraction form
    129,669.10/178,936.45 = 72,314.31/x
  3. Step 3: Cross multiply
    129,669.10x = 178,936.45 × 72,314.31
  4. Step 4: Simplify right side
    129,669.10x = 12,939,665,734.81
  5. Step 5: Solve for x
    x = 12,939,665,734.81/129,669.10
  6. Step 6: Final answer
    x = 99,789.90

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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.