Home / 138,099.42-190,575.51-78,479.58

Finding the Fourth Proportional to 138,099.42, 190,575.51 and 78,479.58

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Solution

The fourth proportional to 138,099.42, 190,575.51 and 78,479.58 is: 108,300.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,099.42 : 190,575.51 = 78,479.58 : x
  2. Step 2: Convert to fraction form
    138,099.42/190,575.51 = 78,479.58/x
  3. Step 3: Cross multiply
    138,099.42x = 190,575.51 × 78,479.58
  4. Step 4: Simplify right side
    138,099.42x = 14,956,285,983.09
  5. Step 5: Solve for x
    x = 14,956,285,983.09/138,099.42
  6. Step 6: Final answer
    x = 108,300.86

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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.