Home / 129,428.82-178,611.75-72,840.06

Finding the Fourth Proportional to 129,428.82, 178,611.75 and 72,840.06

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Solution

The fourth proportional to 129,428.82, 178,611.75 and 72,840.06 is: 100,519.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,428.82 : 178,611.75 = 72,840.06 : x
  2. Step 2: Convert to fraction form
    129,428.82/178,611.75 = 72,840.06/x
  3. Step 3: Cross multiply
    129,428.82x = 178,611.75 × 72,840.06
  4. Step 4: Simplify right side
    129,428.82x = 13,010,090,586.71
  5. Step 5: Solve for x
    x = 13,010,090,586.71/129,428.82
  6. Step 6: Final answer
    x = 100,519.27

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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.