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Finding the Fourth Proportional to 28,209.90, 42,316.98 and 9,489.99

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Solution

The fourth proportional to 28,209.90, 42,316.98 and 9,489.99 is: 14,235.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,209.90 : 42,316.98 = 9,489.99 : x
  2. Step 2: Convert to fraction form
    28,209.90/42,316.98 = 9,489.99/x
  3. Step 3: Cross multiply
    28,209.90x = 42,316.98 × 9,489.99
  4. Step 4: Simplify right side
    28,209.90x = 401,587,717.03
  5. Step 5: Solve for x
    x = 401,587,717.03/28,209.90
  6. Step 6: Final answer
    x = 14,235.70

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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.