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Finding the Fourth Proportional to 128,278.69, 177,030.06 and 71,690.06

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Solution

The fourth proportional to 128,278.69, 177,030.06 and 71,690.06 is: 98,935.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,278.69 : 177,030.06 = 71,690.06 : x
  2. Step 2: Convert to fraction form
    128,278.69/177,030.06 = 71,690.06/x
  3. Step 3: Cross multiply
    128,278.69x = 177,030.06 × 71,690.06
  4. Step 4: Simplify right side
    128,278.69x = 12,691,295,796.94
  5. Step 5: Solve for x
    x = 12,691,295,796.94/128,278.69
  6. Step 6: Final answer
    x = 98,935.34

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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.