Home / 128,871-177,919.74-84,236.76

Finding the Fourth Proportional to 128,871, 177,919.74 and 84,236.76

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Solution

The fourth proportional to 128,871, 177,919.74 and 84,236.76 is: 116,297.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,871 : 177,919.74 = 84,236.76 : x
  2. Step 2: Convert to fraction form
    128,871/177,919.74 = 84,236.76/x
  3. Step 3: Cross multiply
    128,871x = 177,919.74 × 84,236.76
  4. Step 4: Simplify right side
    128,871x = 14,987,382,437.64
  5. Step 5: Solve for x
    x = 14,987,382,437.64/128,871
  6. Step 6: Final answer
    x = 116,297.56

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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.