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Finding the Fourth Proportional to 12,863.31, 17,755.53 and 9,888.99

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Solution

The fourth proportional to 12,863.31, 17,755.53 and 9,888.99 is: 13,650.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,863.31 : 17,755.53 = 9,888.99 : x
  2. Step 2: Convert to fraction form
    12,863.31/17,755.53 = 9,888.99/x
  3. Step 3: Cross multiply
    12,863.31x = 17,755.53 × 9,888.99
  4. Step 4: Simplify right side
    12,863.31x = 175,584,258.61
  5. Step 5: Solve for x
    x = 175,584,258.61/12,863.31
  6. Step 6: Final answer
    x = 13,650.01

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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.