Home / 120,128.92-165,778.56-65,681.26

Finding the Fourth Proportional to 120,128.92, 165,778.56 and 65,681.26

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Solution

The fourth proportional to 120,128.92, 165,778.56 and 65,681.26 is: 90,640.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,128.92 : 165,778.56 = 65,681.26 : x
  2. Step 2: Convert to fraction form
    120,128.92/165,778.56 = 65,681.26/x
  3. Step 3: Cross multiply
    120,128.92x = 165,778.56 × 65,681.26
  4. Step 4: Simplify right side
    120,128.92x = 10,888,544,701.79
  5. Step 5: Solve for x
    x = 10,888,544,701.79/120,128.92
  6. Step 6: Final answer
    x = 90,640.49

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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.