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Finding the Fourth Proportional to 9,939.78, 13,707.81 and 8,888.79

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Solution

The fourth proportional to 9,939.78, 13,707.81 and 8,888.79 is: 12,258.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,939.78 : 13,707.81 = 8,888.79 : x
  2. Step 2: Convert to fraction form
    9,939.78/13,707.81 = 8,888.79/x
  3. Step 3: Cross multiply
    9,939.78x = 13,707.81 × 8,888.79
  4. Step 4: Simplify right side
    9,939.78x = 121,845,844.45
  5. Step 5: Solve for x
    x = 121,845,844.45/9,939.78
  6. Step 6: Final answer
    x = 12,258.40

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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.