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Finding the Fourth Proportional to 18,693.55, 25,785.70 and 11,134.81

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Solution

The fourth proportional to 18,693.55, 25,785.70 and 11,134.81 is: 15,359.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,693.55 : 25,785.70 = 11,134.81 : x
  2. Step 2: Convert to fraction form
    18,693.55/25,785.70 = 11,134.81/x
  3. Step 3: Cross multiply
    18,693.55x = 25,785.70 × 11,134.81
  4. Step 4: Simplify right side
    18,693.55x = 287,118,870.22
  5. Step 5: Solve for x
    x = 287,118,870.22/18,693.55
  6. Step 6: Final answer
    x = 15,359.25

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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.