Home / 129,521.90-178,743.21-72,165.02

Finding the Fourth Proportional to 129,521.90, 178,743.21 and 72,165.02

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Solution

The fourth proportional to 129,521.90, 178,743.21 and 72,165.02 is: 99,589.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,521.90 : 178,743.21 = 72,165.02 : x
  2. Step 2: Convert to fraction form
    129,521.90/178,743.21 = 72,165.02/x
  3. Step 3: Cross multiply
    129,521.90x = 178,743.21 × 72,165.02
  4. Step 4: Simplify right side
    129,521.90x = 12,899,007,324.51
  5. Step 5: Solve for x
    x = 12,899,007,324.51/129,521.90
  6. Step 6: Final answer
    x = 99,589.39

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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.