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Finding the Fourth Proportional to 28,636.86, 42,944.99 and 9,911.80

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Solution

The fourth proportional to 28,636.86, 42,944.99 and 9,911.80 is: 14,864.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,636.86 : 42,944.99 = 9,911.80 : x
  2. Step 2: Convert to fraction form
    28,636.86/42,944.99 = 9,911.80/x
  3. Step 3: Cross multiply
    28,636.86x = 42,944.99 × 9,911.80
  4. Step 4: Simplify right side
    28,636.86x = 425,662,102.32
  5. Step 5: Solve for x
    x = 425,662,102.32/28,636.86
  6. Step 6: Final answer
    x = 14,864.14

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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.