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Finding the Fourth Proportional to 31,867.32, 43,978.32 and 18,439.20

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Solution

The fourth proportional to 31,867.32, 43,978.32 and 18,439.20 is: 25,446.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,867.32 : 43,978.32 = 18,439.20 : x
  2. Step 2: Convert to fraction form
    31,867.32/43,978.32 = 18,439.20/x
  3. Step 3: Cross multiply
    31,867.32x = 43,978.32 × 18,439.20
  4. Step 4: Simplify right side
    31,867.32x = 810,925,038.14
  5. Step 5: Solve for x
    x = 810,925,038.14/31,867.32
  6. Step 6: Final answer
    x = 25,446.92

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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.