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Finding the Fourth Proportional to 28,663.57, 42,978.75 and 11,112.85

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Solution

The fourth proportional to 28,663.57, 42,978.75 and 11,112.85 is: 16,662.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,663.57 : 42,978.75 = 11,112.85 : x
  2. Step 2: Convert to fraction form
    28,663.57/42,978.75 = 11,112.85/x
  3. Step 3: Cross multiply
    28,663.57x = 42,978.75 × 11,112.85
  4. Step 4: Simplify right side
    28,663.57x = 477,616,401.94
  5. Step 5: Solve for x
    x = 477,616,401.94/28,663.57
  6. Step 6: Final answer
    x = 16,662.84

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1.5x scale

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.