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Finding the Fourth Proportional to 129,338.78, 178,485.69 and 72,750.14

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Solution

The fourth proportional to 129,338.78, 178,485.69 and 72,750.14 is: 100,394.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,338.78 : 178,485.69 = 72,750.14 : x
  2. Step 2: Convert to fraction form
    129,338.78/178,485.69 = 72,750.14/x
  3. Step 3: Cross multiply
    129,338.78x = 178,485.69 × 72,750.14
  4. Step 4: Simplify right side
    129,338.78x = 12,984,858,935.50
  5. Step 5: Solve for x
    x = 12,984,858,935.50/129,338.78
  6. Step 6: Final answer
    x = 100,394.17

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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.