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Finding the Fourth Proportional to 129,494.94, 178,730.59 and 87,028.87

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Solution

The fourth proportional to 129,494.94, 178,730.59 and 87,028.87 is: 120,118.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,494.94 : 178,730.59 = 87,028.87 : x
  2. Step 2: Convert to fraction form
    129,494.94/178,730.59 = 87,028.87/x
  3. Step 3: Cross multiply
    129,494.94x = 178,730.59 × 87,028.87
  4. Step 4: Simplify right side
    129,494.94x = 15,554,721,282.13
  5. Step 5: Solve for x
    x = 15,554,721,282.13/129,494.94
  6. Step 6: Final answer
    x = 120,118.37

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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.