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Finding the Fourth Proportional to 129,688.80, 194,533.20 and 77,071.20

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Solution

The fourth proportional to 129,688.80, 194,533.20 and 77,071.20 is: 115,606.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,688.80 : 194,533.20 = 77,071.20 : x
  2. Step 2: Convert to fraction form
    129,688.80/194,533.20 = 77,071.20/x
  3. Step 3: Cross multiply
    129,688.80x = 194,533.20 × 77,071.20
  4. Step 4: Simplify right side
    129,688.80x = 14,992,907,163.84
  5. Step 5: Solve for x
    x = 14,992,907,163.84/129,688.80
  6. Step 6: Final answer
    x = 115,606.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.