Home / 128,985.92-177,977.76-78,701.12

Finding the Fourth Proportional to 128,985.92, 177,977.76 and 78,701.12

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Solution

The fourth proportional to 128,985.92, 177,977.76 and 78,701.12 is: 108,593.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,985.92 : 177,977.76 = 78,701.12 : x
  2. Step 2: Convert to fraction form
    128,985.92/177,977.76 = 78,701.12/x
  3. Step 3: Cross multiply
    128,985.92x = 177,977.76 × 78,701.12
  4. Step 4: Simplify right side
    128,985.92x = 14,007,049,047.09
  5. Step 5: Solve for x
    x = 14,007,049,047.09/128,985.92
  6. Step 6: Final answer
    x = 108,593.63

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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.