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Finding the Fourth Proportional to 128,643.69, 177,528.29 and 78,342.69

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Solution

The fourth proportional to 128,643.69, 177,528.29 and 78,342.69 is: 108,112.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,643.69 : 177,528.29 = 78,342.69 : x
  2. Step 2: Convert to fraction form
    128,643.69/177,528.29 = 78,342.69/x
  3. Step 3: Cross multiply
    128,643.69x = 177,528.29 × 78,342.69
  4. Step 4: Simplify right side
    128,643.69x = 13,908,043,789.70
  5. Step 5: Solve for x
    x = 13,908,043,789.70/128,643.69
  6. Step 6: Final answer
    x = 108,112.91

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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.