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Finding the Fourth Proportional to 128,618.88, 177,555.66 and 85,669.84

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Solution

The fourth proportional to 128,618.88, 177,555.66 and 85,669.84 is: 118,265.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,618.88 : 177,555.66 = 85,669.84 : x
  2. Step 2: Convert to fraction form
    128,618.88/177,555.66 = 85,669.84/x
  3. Step 3: Cross multiply
    128,618.88x = 177,555.66 × 85,669.84
  4. Step 4: Simplify right side
    128,618.88x = 15,211,164,983.29
  5. Step 5: Solve for x
    x = 15,211,164,983.29/128,618.88
  6. Step 6: Final answer
    x = 118,265.41

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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.