Home / 129,370.88-178,531.08-72,782.72

Finding the Fourth Proportional to 129,370.88, 178,531.08 and 72,782.72

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Solution

The fourth proportional to 129,370.88, 178,531.08 and 72,782.72 is: 100,439.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,370.88 : 178,531.08 = 72,782.72 : x
  2. Step 2: Convert to fraction form
    129,370.88/178,531.08 = 72,782.72/x
  3. Step 3: Cross multiply
    129,370.88x = 178,531.08 × 72,782.72
  4. Step 4: Simplify right side
    129,370.88x = 12,993,977,606.94
  5. Step 5: Solve for x
    x = 12,993,977,606.94/129,370.88
  6. Step 6: Final answer
    x = 100,439.74

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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.