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Finding the Fourth Proportional to 12,405.76, 18,590.87 and 9,619.38

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Solution

The fourth proportional to 12,405.76, 18,590.87 and 9,619.38 is: 14,415.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.76 : 18,590.87 = 9,619.38 : x
  2. Step 2: Convert to fraction form
    12,405.76/18,590.87 = 9,619.38/x
  3. Step 3: Cross multiply
    12,405.76x = 18,590.87 × 9,619.38
  4. Step 4: Simplify right side
    12,405.76x = 178,832,665.29
  5. Step 5: Solve for x
    x = 178,832,665.29/12,405.76
  6. Step 6: Final answer
    x = 14,415.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.