Home / 19,878.32-27,442.74-15,331.05

Finding the Fourth Proportional to 19,878.32, 27,442.74 and 15,331.05

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Solution

The fourth proportional to 19,878.32, 27,442.74 and 15,331.05 is: 21,165.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,878.32 : 27,442.74 = 15,331.05 : x
  2. Step 2: Convert to fraction form
    19,878.32/27,442.74 = 15,331.05/x
  3. Step 3: Cross multiply
    19,878.32x = 27,442.74 × 15,331.05
  4. Step 4: Simplify right side
    19,878.32x = 420,726,019.08
  5. Step 5: Solve for x
    x = 420,726,019.08/19,878.32
  6. Step 6: Final answer
    x = 21,165.07

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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.