Home / 30,878.44-42,612.26-18,129.12

Finding the Fourth Proportional to 30,878.44, 42,612.26 and 18,129.12

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Solution

The fourth proportional to 30,878.44, 42,612.26 and 18,129.12 is: 25,018.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,878.44 : 42,612.26 = 18,129.12 : x
  2. Step 2: Convert to fraction form
    30,878.44/42,612.26 = 18,129.12/x
  3. Step 3: Cross multiply
    30,878.44x = 42,612.26 × 18,129.12
  4. Step 4: Simplify right side
    30,878.44x = 772,522,775.01
  5. Step 5: Solve for x
    x = 772,522,775.01/30,878.44
  6. Step 6: Final answer
    x = 25,018.19

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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.