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Finding the Fourth Proportional to 9,380.81, 12,930.63 and 7,388.21

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Solution

The fourth proportional to 9,380.81, 12,930.63 and 7,388.21 is: 10,184.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,380.81 : 12,930.63 = 7,388.21 : x
  2. Step 2: Convert to fraction form
    9,380.81/12,930.63 = 7,388.21/x
  3. Step 3: Cross multiply
    9,380.81x = 12,930.63 × 7,388.21
  4. Step 4: Simplify right side
    9,380.81x = 95,534,209.87
  5. Step 5: Solve for x
    x = 95,534,209.87/9,380.81
  6. Step 6: Final answer
    x = 10,184.00

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Half scale
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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.