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Finding the Fourth Proportional to 129,475.56, 178,731.57 and 87,058.68

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Solution

The fourth proportional to 129,475.56, 178,731.57 and 87,058.68 is: 120,178.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,475.56 : 178,731.57 = 87,058.68 : x
  2. Step 2: Convert to fraction form
    129,475.56/178,731.57 = 87,058.68/x
  3. Step 3: Cross multiply
    129,475.56x = 178,731.57 × 87,058.68
  4. Step 4: Simplify right side
    129,475.56x = 15,560,134,558.53
  5. Step 5: Solve for x
    x = 15,560,134,558.53/129,475.56
  6. Step 6: Final answer
    x = 120,178.16

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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.