Home / 128,991.08-178,012.26-75,310.44

Finding the Fourth Proportional to 128,991.08, 178,012.26 and 75,310.44

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Solution

The fourth proportional to 128,991.08, 178,012.26 and 75,310.44 is: 103,931.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,991.08 : 178,012.26 = 75,310.44 : x
  2. Step 2: Convert to fraction form
    128,991.08/178,012.26 = 75,310.44/x
  3. Step 3: Cross multiply
    128,991.08x = 178,012.26 × 75,310.44
  4. Step 4: Simplify right side
    128,991.08x = 13,406,181,625.99
  5. Step 5: Solve for x
    x = 13,406,181,625.99/128,991.08
  6. Step 6: Final answer
    x = 103,931.08

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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.