Home / 85,964.05-128,964.30-25,987.60

Finding the Fourth Proportional to 85,964.05, 128,964.30 and 25,987.60

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Solution

The fourth proportional to 85,964.05, 128,964.30 and 25,987.60 is: 38,986.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,964.05 : 128,964.30 = 25,987.60 : x
  2. Step 2: Convert to fraction form
    85,964.05/128,964.30 = 25,987.60/x
  3. Step 3: Cross multiply
    85,964.05x = 128,964.30 × 25,987.60
  4. Step 4: Simplify right side
    85,964.05x = 3,351,472,642.68
  5. Step 5: Solve for x
    x = 3,351,472,642.68/85,964.05
  6. Step 6: Final answer
    x = 38,986.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.