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Finding the Fourth Proportional to 18,774.13, 25,909.11 and 10,390.63

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Solution

The fourth proportional to 18,774.13, 25,909.11 and 10,390.63 is: 14,339.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,774.13 : 25,909.11 = 10,390.63 : x
  2. Step 2: Convert to fraction form
    18,774.13/25,909.11 = 10,390.63/x
  3. Step 3: Cross multiply
    18,774.13x = 25,909.11 × 10,390.63
  4. Step 4: Simplify right side
    18,774.13x = 269,211,975.64
  5. Step 5: Solve for x
    x = 269,211,975.64/18,774.13
  6. Step 6: Final answer
    x = 14,339.52

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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.