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Finding the Fourth Proportional to 128,555.56, 177,408.66 and 77,570.92

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Solution

The fourth proportional to 128,555.56, 177,408.66 and 77,570.92 is: 107,049.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,555.56 : 177,408.66 = 77,570.92 : x
  2. Step 2: Convert to fraction form
    128,555.56/177,408.66 = 77,570.92/x
  3. Step 3: Cross multiply
    128,555.56x = 177,408.66 × 77,570.92
  4. Step 4: Simplify right side
    128,555.56x = 13,761,752,972.17
  5. Step 5: Solve for x
    x = 13,761,752,972.17/128,555.56
  6. Step 6: Final answer
    x = 107,049.07

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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.