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Finding the Fourth Proportional to 13,631.46, 18,809.74 and 7,889.90

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Solution

The fourth proportional to 13,631.46, 18,809.74 and 7,889.90 is: 10,887.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,631.46 : 18,809.74 = 7,889.90 : x
  2. Step 2: Convert to fraction form
    13,631.46/18,809.74 = 7,889.90/x
  3. Step 3: Cross multiply
    13,631.46x = 18,809.74 × 7,889.90
  4. Step 4: Simplify right side
    13,631.46x = 148,406,967.63
  5. Step 5: Solve for x
    x = 148,406,967.63/13,631.46
  6. Step 6: Final answer
    x = 10,887.09

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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.