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Finding the Fourth Proportional to 129,985.80, 194,978.70 and 70,936.80

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Solution

The fourth proportional to 129,985.80, 194,978.70 and 70,936.80 is: 106,405.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,985.80 : 194,978.70 = 70,936.80 : x
  2. Step 2: Convert to fraction form
    129,985.80/194,978.70 = 70,936.80/x
  3. Step 3: Cross multiply
    129,985.80x = 194,978.70 × 70,936.80
  4. Step 4: Simplify right side
    129,985.80x = 13,831,165,046.16
  5. Step 5: Solve for x
    x = 13,831,165,046.16/129,985.80
  6. Step 6: Final answer
    x = 106,405.20

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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.