Home / 128,705.47-177,416.68-90,357.44

Finding the Fourth Proportional to 128,705.47, 177,416.68 and 90,357.44

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Solution

The fourth proportional to 128,705.47, 177,416.68 and 90,357.44 is: 124,555.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,705.47 : 177,416.68 = 90,357.44 : x
  2. Step 2: Convert to fraction form
    128,705.47/177,416.68 = 90,357.44/x
  3. Step 3: Cross multiply
    128,705.47x = 177,416.68 × 90,357.44
  4. Step 4: Simplify right side
    128,705.47x = 16,030,917,072.51
  5. Step 5: Solve for x
    x = 16,030,917,072.51/128,705.47
  6. Step 6: Final answer
    x = 124,555.05

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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.