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Finding the Fourth Proportional to 9,911.60, 13,678 and 5,720.66

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Solution

The fourth proportional to 9,911.60, 13,678 and 5,720.66 is: 7,894.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,911.60 : 13,678 = 5,720.66 : x
  2. Step 2: Convert to fraction form
    9,911.60/13,678 = 5,720.66/x
  3. Step 3: Cross multiply
    9,911.60x = 13,678 × 5,720.66
  4. Step 4: Simplify right side
    9,911.60x = 78,247,187.48
  5. Step 5: Solve for x
    x = 78,247,187.48/9,911.60
  6. Step 6: Final answer
    x = 7,894.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.