Home / 128,370.23-177,159.09-71,781.59

Finding the Fourth Proportional to 128,370.23, 177,159.09 and 71,781.59

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Solution

The fourth proportional to 128,370.23, 177,159.09 and 71,781.59 is: 99,063.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,370.23 : 177,159.09 = 71,781.59 : x
  2. Step 2: Convert to fraction form
    128,370.23/177,159.09 = 71,781.59/x
  3. Step 3: Cross multiply
    128,370.23x = 177,159.09 × 71,781.59
  4. Step 4: Simplify right side
    128,370.23x = 12,716,761,163.15
  5. Step 5: Solve for x
    x = 12,716,761,163.15/128,370.23
  6. Step 6: Final answer
    x = 99,063.16

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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.