Home / 128,531.56-177,338.70-78,194.92

Finding the Fourth Proportional to 128,531.56, 177,338.70 and 78,194.92

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Solution

The fourth proportional to 128,531.56, 177,338.70 and 78,194.92 is: 107,887.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,531.56 : 177,338.70 = 78,194.92 : x
  2. Step 2: Convert to fraction form
    128,531.56/177,338.70 = 78,194.92/x
  3. Step 3: Cross multiply
    128,531.56x = 177,338.70 × 78,194.92
  4. Step 4: Simplify right side
    128,531.56x = 13,866,985,459.40
  5. Step 5: Solve for x
    x = 13,866,985,459.40/128,531.56
  6. Step 6: Final answer
    x = 107,887.79

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1.5x scale

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.