Home / 129,372.30-178,529.12-72,009.72

Finding the Fourth Proportional to 129,372.30, 178,529.12 and 72,009.72

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Solution

The fourth proportional to 129,372.30, 178,529.12 and 72,009.72 is: 99,370.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,372.30 : 178,529.12 = 72,009.72 : x
  2. Step 2: Convert to fraction form
    129,372.30/178,529.12 = 72,009.72/x
  3. Step 3: Cross multiply
    129,372.30x = 178,529.12 × 72,009.72
  4. Step 4: Simplify right side
    129,372.30x = 12,855,831,943.05
  5. Step 5: Solve for x
    x = 12,855,831,943.05/129,372.30
  6. Step 6: Final answer
    x = 99,370.82

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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.