Home / 129,670.88-178,948.98-72,309.64

Finding the Fourth Proportional to 129,670.88, 178,948.98 and 72,309.64

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Solution

The fourth proportional to 129,670.88, 178,948.98 and 72,309.64 is: 99,789.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,670.88 : 178,948.98 = 72,309.64 : x
  2. Step 2: Convert to fraction form
    129,670.88/178,948.98 = 72,309.64/x
  3. Step 3: Cross multiply
    129,670.88x = 178,948.98 × 72,309.64
  4. Step 4: Simplify right side
    129,670.88x = 12,939,735,960.62
  5. Step 5: Solve for x
    x = 12,939,735,960.62/129,670.88
  6. Step 6: Final answer
    x = 99,789.07

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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.