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Finding the Fourth Proportional to 129,313.35, 178,450.71 and 72,724.72

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Solution

The fourth proportional to 129,313.35, 178,450.71 and 72,724.72 is: 100,359.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,313.35 : 178,450.71 = 72,724.72 : x
  2. Step 2: Convert to fraction form
    129,313.35/178,450.71 = 72,724.72/x
  3. Step 3: Cross multiply
    129,313.35x = 178,450.71 × 72,724.72
  4. Step 4: Simplify right side
    129,313.35x = 12,977,777,918.55
  5. Step 5: Solve for x
    x = 12,977,777,918.55/129,313.35
  6. Step 6: Final answer
    x = 100,359.15

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1.5x scale

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.