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Finding the Fourth Proportional to 9,876.39, 13,629.42 and 5,684.64

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Solution

The fourth proportional to 9,876.39, 13,629.42 and 5,684.64 is: 7,844.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,876.39 : 13,629.42 = 5,684.64 : x
  2. Step 2: Convert to fraction form
    9,876.39/13,629.42 = 5,684.64/x
  3. Step 3: Cross multiply
    9,876.39x = 13,629.42 × 5,684.64
  4. Step 4: Simplify right side
    9,876.39x = 77,478,346.11
  5. Step 5: Solve for x
    x = 77,478,346.11/9,876.39
  6. Step 6: Final answer
    x = 7,844.80

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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.