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Finding the Fourth Proportional to 31,658.64, 43,688.84 and 18,225

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Solution

The fourth proportional to 31,658.64, 43,688.84 and 18,225 is: 25,150.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,658.64 : 43,688.84 = 18,225 : x
  2. Step 2: Convert to fraction form
    31,658.64/43,688.84 = 18,225/x
  3. Step 3: Cross multiply
    31,658.64x = 43,688.84 × 18,225
  4. Step 4: Simplify right side
    31,658.64x = 796,229,109.00
  5. Step 5: Solve for x
    x = 796,229,109.00/31,658.64
  6. Step 6: Final answer
    x = 25,150.45

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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.