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Finding the Fourth Proportional to 128,841.57, 177,740.01 and 85,841.01

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Solution

The fourth proportional to 128,841.57, 177,740.01 and 85,841.01 is: 118,419.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,841.57 : 177,740.01 = 85,841.01 : x
  2. Step 2: Convert to fraction form
    128,841.57/177,740.01 = 85,841.01/x
  3. Step 3: Cross multiply
    128,841.57x = 177,740.01 × 85,841.01
  4. Step 4: Simplify right side
    128,841.57x = 15,257,381,975.81
  5. Step 5: Solve for x
    x = 15,257,381,975.81/128,841.57
  6. Step 6: Final answer
    x = 118,419.71

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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.