Home / 1,575.21-2,172.38-985.80

Finding the Fourth Proportional to 1,575.21, 2,172.38 and 985.80

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Solution

The fourth proportional to 1,575.21, 2,172.38 and 985.80 is: 1,359.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,575.21 : 2,172.38 = 985.80 : x
  2. Step 2: Convert to fraction form
    1,575.21/2,172.38 = 985.80/x
  3. Step 3: Cross multiply
    1,575.21x = 2,172.38 × 985.80
  4. Step 4: Simplify right side
    1,575.21x = 2,141,527.28
  5. Step 5: Solve for x
    x = 2,141,527.28/1,575.21
  6. Step 6: Final answer
    x = 1,359.52

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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.