Home / 128,683.29-177,361.16-85,585.71

Finding the Fourth Proportional to 128,683.29, 177,361.16 and 85,585.71

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Solution

The fourth proportional to 128,683.29, 177,361.16 and 85,585.71 is: 117,960.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,683.29 : 177,361.16 = 85,585.71 : x
  2. Step 2: Convert to fraction form
    128,683.29/177,361.16 = 85,585.71/x
  3. Step 3: Cross multiply
    128,683.29x = 177,361.16 × 85,585.71
  4. Step 4: Simplify right side
    128,683.29x = 15,179,580,377.10
  5. Step 5: Solve for x
    x = 15,179,580,377.10/128,683.29
  6. Step 6: Final answer
    x = 117,960.77

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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.