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Finding the Fourth Proportional to 129,530.40, 178,748.46 and 72,940.56

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Solution

The fourth proportional to 129,530.40, 178,748.46 and 72,940.56 is: 100,656.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,530.40 : 178,748.46 = 72,940.56 : x
  2. Step 2: Convert to fraction form
    129,530.40/178,748.46 = 72,940.56/x
  3. Step 3: Cross multiply
    129,530.40x = 178,748.46 × 72,940.56
  4. Step 4: Simplify right side
    129,530.40x = 13,038,012,771.54
  5. Step 5: Solve for x
    x = 13,038,012,771.54/129,530.40
  6. Step 6: Final answer
    x = 100,656.01

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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.