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Finding the Fourth Proportional to 19,703.28, 29,485.58 and 12,311.22

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Solution

The fourth proportional to 19,703.28, 29,485.58 and 12,311.22 is: 18,423.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,703.28 : 29,485.58 = 12,311.22 : x
  2. Step 2: Convert to fraction form
    19,703.28/29,485.58 = 12,311.22/x
  3. Step 3: Cross multiply
    19,703.28x = 29,485.58 × 12,311.22
  4. Step 4: Simplify right side
    19,703.28x = 363,003,400.65
  5. Step 5: Solve for x
    x = 363,003,400.65/19,703.28
  6. Step 6: Final answer
    x = 18,423.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.