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Finding the Fourth Proportional to 128,636.80, 177,528.20 and 77,662.08

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Solution

The fourth proportional to 128,636.80, 177,528.20 and 77,662.08 is: 107,179.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,636.80 : 177,528.20 = 77,662.08 : x
  2. Step 2: Convert to fraction form
    128,636.80/177,528.20 = 77,662.08/x
  3. Step 3: Cross multiply
    128,636.80x = 177,528.20 × 77,662.08
  4. Step 4: Simplify right side
    128,636.80x = 13,787,209,270.66
  5. Step 5: Solve for x
    x = 13,787,209,270.66/128,636.80
  6. Step 6: Final answer
    x = 107,179.36

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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.