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Finding the Fourth Proportional to 9,621, 13,279.68 and 6,440.40

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Solution

The fourth proportional to 9,621, 13,279.68 and 6,440.40 is: 8,889.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,621 : 13,279.68 = 6,440.40 : x
  2. Step 2: Convert to fraction form
    9,621/13,279.68 = 6,440.40/x
  3. Step 3: Cross multiply
    9,621x = 13,279.68 × 6,440.40
  4. Step 4: Simplify right side
    9,621x = 85,526,451.07
  5. Step 5: Solve for x
    x = 85,526,451.07/9,621
  6. Step 6: Final answer
    x = 8,889.56

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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.