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Finding the Fourth Proportional to 128,643.60, 177,528.16 and 78,342.60

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Solution

The fourth proportional to 128,643.60, 177,528.16 and 78,342.60 is: 108,112.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,643.60 : 177,528.16 = 78,342.60 : x
  2. Step 2: Convert to fraction form
    128,643.60/177,528.16 = 78,342.60/x
  3. Step 3: Cross multiply
    128,643.60x = 177,528.16 × 78,342.60
  4. Step 4: Simplify right side
    128,643.60x = 13,908,016,739.98
  5. Step 5: Solve for x
    x = 13,908,016,739.98/128,643.60
  6. Step 6: Final answer
    x = 108,112.78

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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.