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Finding the Fourth Proportional to 18,671.31, 25,760.90 and 11,113.86

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Solution

The fourth proportional to 18,671.31, 25,760.90 and 11,113.86 is: 15,333.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,671.31 : 25,760.90 = 11,113.86 : x
  2. Step 2: Convert to fraction form
    18,671.31/25,760.90 = 11,113.86/x
  3. Step 3: Cross multiply
    18,671.31x = 25,760.90 × 11,113.86
  4. Step 4: Simplify right side
    18,671.31x = 286,303,036.07
  5. Step 5: Solve for x
    x = 286,303,036.07/18,671.31
  6. Step 6: Final answer
    x = 15,333.85

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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.