Home / 2,172.15-3,257.53-785.30

Finding the Fourth Proportional to 2,172.15, 3,257.53 and 785.30

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Solution

The fourth proportional to 2,172.15, 3,257.53 and 785.30 is: 1,177.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.15 : 3,257.53 = 785.30 : x
  2. Step 2: Convert to fraction form
    2,172.15/3,257.53 = 785.30/x
  3. Step 3: Cross multiply
    2,172.15x = 3,257.53 × 785.30
  4. Step 4: Simplify right side
    2,172.15x = 2,558,135.22
  5. Step 5: Solve for x
    x = 2,558,135.22/2,172.15
  6. Step 6: Final answer
    x = 1,177.70

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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.