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Finding the Fourth Proportional to 19,320.12, 28,958.04 and 8,910

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Solution

The fourth proportional to 19,320.12, 28,958.04 and 8,910 is: 13,354.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,320.12 : 28,958.04 = 8,910 : x
  2. Step 2: Convert to fraction form
    19,320.12/28,958.04 = 8,910/x
  3. Step 3: Cross multiply
    19,320.12x = 28,958.04 × 8,910
  4. Step 4: Simplify right side
    19,320.12x = 258,016,136.40
  5. Step 5: Solve for x
    x = 258,016,136.40/19,320.12
  6. Step 6: Final answer
    x = 13,354.79

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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.