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Finding the Fourth Proportional to 31,819.96, 43,908.16 and 18,390.16

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Solution

The fourth proportional to 31,819.96, 43,908.16 and 18,390.16 is: 25,376.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,819.96 : 43,908.16 = 18,390.16 : x
  2. Step 2: Convert to fraction form
    31,819.96/43,908.16 = 18,390.16/x
  3. Step 3: Cross multiply
    31,819.96x = 43,908.16 × 18,390.16
  4. Step 4: Simplify right side
    31,819.96x = 807,478,087.71
  5. Step 5: Solve for x
    x = 807,478,087.71/31,819.96
  6. Step 6: Final answer
    x = 25,376.46

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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.