Home / 128,733.36-177,651.76-78,432.40

Finding the Fourth Proportional to 128,733.36, 177,651.76 and 78,432.40

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Solution

The fourth proportional to 128,733.36, 177,651.76 and 78,432.40 is: 108,236.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,733.36 : 177,651.76 = 78,432.40 : x
  2. Step 2: Convert to fraction form
    128,733.36/177,651.76 = 78,432.40/x
  3. Step 3: Cross multiply
    128,733.36x = 177,651.76 × 78,432.40
  4. Step 4: Simplify right side
    128,733.36x = 13,933,653,901.02
  5. Step 5: Solve for x
    x = 13,933,653,901.02/128,733.36
  6. Step 6: Final answer
    x = 108,236.54

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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.