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Finding the Fourth Proportional to 9,620.80, 13,225.28 and 8,670.40

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Solution

The fourth proportional to 9,620.80, 13,225.28 and 8,670.40 is: 11,918.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,620.80 : 13,225.28 = 8,670.40 : x
  2. Step 2: Convert to fraction form
    9,620.80/13,225.28 = 8,670.40/x
  3. Step 3: Cross multiply
    9,620.80x = 13,225.28 × 8,670.40
  4. Step 4: Simplify right side
    9,620.80x = 114,668,467.71
  5. Step 5: Solve for x
    x = 114,668,467.71/9,620.80
  6. Step 6: Final answer
    x = 11,918.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.